RE: how to purify net-snmp code
This is a discussion on RE: how to purify net-snmp code within the SNMP Coders forums, part of the Networking and Network Related category; This is a multi-part message in MIME format. --===============1493552920== Content-class: urn:content-classes:message Content-Type: multipart/alternative; ...
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RE: how to purify net-snmp code
This is a multi-part message in MIME format.
--===============1493552920== Content-class: urn:content-classes:message Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C77B2B.8134B8D5" This is a multi-part message in MIME format. ------_=_NextPart_001_01C77B2B.8134B8D5 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Devi, snmp_parse_args() can be customized for your purpose, but we wrote our own parsing logic to handle trapsink, and trapsess directive. Regards,=20 Santhosh=20 ________________________________ From: Devi U [mailto:udevi@TechMahindra.com]=20 Sent: Monday, April 09, 2007 5:20 PM To: SANTHOSH S (WT01 - Broadband Networks); net-snmp-coders@lists.sourceforge.net Subject: RE: how to purify net-snmp code =20 =20 Santhosh, =20 I have tried using session for sending traps.There was no increase in memory usage for each trap sent. Thanx for ur kindly help.I have hardcoded session variable for testing. As per our existing design of sending traps using send_v2trap() api, traps were forwarded to management systems based on trapsess entry in snmpd.conf. Is there any way to initialise session variable based on configuration file? =20 Other wise i have to read trapsess entry from snmpd.conf and call snmp_parse_args() method in snmplib/snmp_parse_args.c to initialise session variable. =20 Thanx, Devi.U=20 =20 =20 =20 =20 ________________________________ From: Devi U Sent: Fri 3/30/2007 8:18 PM To: santhosh.sundarasamy@wipro.com; net-snmp-coders@lists.sourceforge.net Subject: RE: how to purify net-snmp code Santhosh, =20 Thanx for ur information and timely help. I have uncommented and tested, even then 40K increase there for every trap sent. =20 we have not used table in notification, but have one table in the same MIB for which get,getnext and getbulk is allowed. =20 we have not added any OID to trap var bind which is defined as/under table. =20 I have noted that memory size is not increasing beyond 47MB. =20 Initially when started memory size is nearly 8K. I guess for nearly 1024 traps(1024*40K=3D40M) ,memory usage increases and after that it is not increasing. =20 I dont why netsnmp_set_row_column() is hit in gdb while sending the traps.=20 =20 Thanx, Devi.U =20 =20 ________________________________ From: santhosh.sundarasamy@wipro.com [mailto:santhosh.sundarasamy@wipro.com] Sent: Fri 3/30/2007 4:24 PM To: Devi U; net-snmp-coders@lists.sourceforge.net Subject: RE: how to purify net-snmp code Devi, =20 Please find my inline comments. Regards,=20 Santhosh=20 ________________________________ From: Devi U [mailto:udevi@TechMahindra.com]=20 Sent: Friday, March 30, 2007 3:22 PM To: SANTHOSH S (WT01 - Broadband Networks); net-snmp-coders@lists.sourceforge.net Subject: RE: how to purify net-snmp code =20 =20 =20 Hi, =20 Very Sorry for my late reply. I was assigned to other works and back to this problem now. after freeing varbind, memory usage was not reduced. =20 we are sending traps only and traps are received properly in management system configured.(Verified thro' Advent Net Manager - Trap viewer) I have cross verified with other implementations and i cant find any problem in our implementation. =20 Using gdb , I have identified that out of 40 K=20 1. 8K is increased in method -=20 =20 agent/agent_trap.c - send_trap_to_sess(netsnmp_session * sess, netsnmp_pdu *template_pdu) =20 we are using net-snmp version 5.3.0.1 and line 881 /* snmp_free_pdu(pdu); */ is commented. In net-snmp version 5.4 it is uncommented. [Santhosh] we used 5.2.1. This might be the issue, Uncomment snmp_free_pdu() in 5.3.0.1 and verify. =20 2. 32 K ( increasing by 8 K for every call,this method is called in for loop ) is increased in method -=20 agent/helpers/table_dataset.c - netsnmp_set_row_column(netsnmp_table_row *row, unsigned int column, int type, const char *value, size_t value_len) =20 I doubt whether memory allocated and pointed to by row is freed or not. =20 =20 Code flow to netsnmp_set_row_column=20 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D #0 netsnmp_set_row_column (row=3D0x187a8b8, column=3D3, type=3D2, value=3D0xffbfeb74 "", value_len=3D4) at table_dataset.c:1224 #1 0xff2c226c in log_notification (pdu=3D0x181dfa8, transport=3D0x3408) at notification-log-mib/notification_log.c:687 #2 0xff2bcc0c in send_notifications (major=3D2136456, minor=3D7, serverarg=3D0x2ffd08, clientarg=3D0xff304fe8) at notification/snmpNotifyTable.c:260 #3 0xff15ace0 in snmp_call_callbacks (major=3D1, minor=3D7, caller_arg=3D0x2ffd08) at callback.c:323 #4 0xff3688b0 in netsnmp_send_traps (trap=3D-1, specific=3D-1, enterprise=3D0xff392a64, enterprise_length=3D10, vars=3D0x2209320, context=3D0x0, flags=3D0) = at agent_trap.c:783 #5 0xff3689d0 in send_enterprise_trap_vars (trap=3D-1, specific=3D-1, enterprise=3D0xff392a64, enterprise_length=3D10, vars=3D0x2209320) at agent_trap.c:797 #6 0xff29d0bc in send_eventTrap_trap () at ssg/ssg.c:1349 <------ Here we called send_v2trap #7 0xff15d940 in run_alarms () at snmp_alarm.c:251 =20 [Santhosh] Are you adding any OID to trap var bind which is defined as/under table? To isolate the issue remove table varbinds in trap PDU and see the memory usage.=20 If with out any table OID added in the trap memory size reduced, then the issue is with the dataset (you might have used mib2c.create-dataset.conf template to implement your private table).=20 =20 =20 Thanx, Devi.U =20 ________________________________ From: santhosh.sundarasamy@wipro.com [mailto:santhosh.sundarasamy@wipro.com] Sent: Wed 3/14/2007 12:08 PM To: Devi U; net-snmp-coders@lists.sourceforge.net Subject: RE: how to purify net-snmp code =20 Devi, After freeing varbind, usage should decrease; PDU is already freed in netsnmp_send_traps() itself ( invoked by send_v2trap). Sending trap or inform? Are you receiving the traps in trapd? Cross check the API usage in other implementations (grep send_v2trap `find . -name "*.c"`) We used method similar to apps/snmptrap.c and there is no memory usage raised / leaks. Pls refer snmptrap.c file for session creation & deletion. - Santhosh ________________________________________ From: Devi U [mailto:udevi@TechMahindra.com] Sent: Tuesday, March 13, 2007 7:30 PM To: SANTHOSH S (WT01 - Broadband Networks); net-snmp-coders@lists.sourceforge.net Subject: RE: how to purify net-snmp code =20 Santhosh, =20 Thanx for ur immediate response. followed the same example - /examples/notification.c =20 snmp_free_varbind is called in our code after send_v2trap(). =20 In top output, i can see the size remains same even after snmp_free_varbind() is called.should size decrease after free is called? =20 For every 100 msec, callback will be called,snmp_varlist_add_variable() is used to store the variables and send_v2trap() is called for sending a single trap. =20 I dont know how to create session / send all traps in a single session. =20 Thanx, Devi.U ________________________________________ From: santhosh.sundarasamy@wipro.com [mailto:santhosh.sundarasamy@wipro.com] Sent: Tue 3/13/2007 7:03 PM To: Devi U; net-snmp-coders@lists.sourceforge.net Subject: RE: how to purify net-snmp code Hi Devi, The increase shown in top is memory usage by the application; all increased bytes might have not been leaked. You need to free the varbinds after sending each trap/inform. snmp_free_varbind(notification_vars); refer: http://www.net-snmp.org/dev/agent/no...c-example.html =20 Print the "top" output after freeing varbind and check the usage. Are you using single session to send all trap/inform or creating session before sending each inform/trap? - Santhosh ________________________________________ From: Devi U [mailto:udevi@TechMahindra.com] Sent: Tuesday, March 13, 2007 6:44 PM To: net-snmp-coders@lists.sourceforge.net Cc: SANTHOSH S (WT01 - Broadband Networks) Subject: RE: how to purify net-snmp code Hi, =20 thanx santhosh.. I am able to purify the code.. =20 I feel that memory leak is there when send_v2trap is called, but i am not getting any MLK/PLK in traces =20 top display: =20 26760 root 1 0 19 9248K 5608K run 0:01 0.30% snmpd =20 top display after a trap is sent =3D=3D=3D> for each trap sent there is = a increase of 40K in SIZE and goes upto 50M. 26760 root 1 0 19 9288K 5648K run 0:01 0.31% snmpd =20 we are using net-snmp version 5.3.0.1. =20 whether above increase in SIZE is memory leak? =20 Thanx, Devi.U The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. 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&nbs= p; snmp_parse_args() can be customized for your purpose, but we wrote our own parsing logic = to handle trapsink, and trapsess directive.<o:p></o:p></span></font></p> <div> <p class=3Dsection1><font size=3D2 color=3Dblue face=3D"Book = Antiqua"><span style=3D'font-size:11.0pt;font-family:"Book = Antiqua";color:blue'>Regards, <br> Santhosh </span></font><font size=3D2 face=3D"Book Antiqua"><span = style=3D'font-size: 11.0pt;font-family:"Book Antiqua"'><o:p></o:p></span></font></p> </div> <div> <div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font = size=3D3 face=3D"Times New Roman"><span style=3D'font-size:12.0pt'> <hr size=3D2 width=3D"100%" align=3Dcenter tabindex=3D-1> </span></font></div> <p class=3DMsoNormal><b><font size=3D2 face=3DTahoma><span = style=3D'font-size:10.0pt; font-family:Tahoma;font-weight:bold'>From:</span></font></b><font = size=3D2 face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'> Devi = U [mailto:<st1:PersonName w:st=3D"on">udevi@TechMahindra.com</st1:PersonName>] <br> <b><span style=3D'font-weight:bold'>Sent:</span></b> Monday, April 09, = 2007 5:20 PM<br> <b><span style=3D'font-weight:bold'>To:</span></b> SANTHOSH S (WT01 - = Broadband Networks); <st1:PersonName = w:st=3D"on">net-snmp-coders@lists.sourceforge.net</st1:PersonName><br> <b><span style=3D'font-weight:bold'>Subject:</span></b> RE: how to = purify net-snmp code</span></font><o:p></o:p></p> </div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'><o:p> </o:p></span></font></p> <div id=3DidOWAReplyText85982> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'>Santhosh,<o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'>I have tried using session for sending traps.There was no = increase in memory usage for each trap sent. Thanx for <st1:City = w:st=3D"on"><st1:place w:st=3D"on">ur</st1:place></st1:City> kindly help.I have hardcoded = session variable for testing. As per our existing design of sending traps using send_v2trap() api, traps were forwarded to management systems based = on trapsess entry in snmpd.conf. Is there any way to initialise session = variable based on configuration file?<o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'>Other wise i have to read trapsess entry from snmpd.conf = and call snmp_parse_args() method in snmplib/snmp_parse_args.c to initialise = session variable.<o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'>Thanx,<o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'>Devi.U <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'><br> <o:p></o:p></span></font></p> </div> <div> <div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font = size=3D3 face=3D"Times New Roman"><span style=3D'font-size:12.0pt'> <hr size=3D2 width=3D"100%" align=3Dcenter tabIndex=3D-1> </span></font></div> </div> <div> <p class=3DMsoNormal style=3D'margin-bottom:12.0pt'><b><font size=3D2 = face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</spa= n></font></b><font size=3D2 face=3DTahoma><span = style=3D'font-size:10.0pt;font-family:Tahoma'> Devi U<br> <b><span style=3D'font-weight:bold'>Sent:</span></b> Fri 3/30/2007 8:18 = PM<br> <b><span style=3D'font-weight:bold'>To:</span></b> santhosh.sundarasamy@wipro.com; <st1:PersonName = w:st=3D"on">net-snmp-coders@lists.sourceforge.net</st1:PersonName><br> <b><span style=3D'font-weight:bold'>Subject:</span></b> RE: how to = purify net-snmp code</span></font><o:p></o:p></p> </div> <div> <div id=3DidOWAReplyText65303> <div> <p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span = style=3D'font-size: 10.0pt;font-family:Arial;color:black'>Santhosh,</span></font><o:p></o:p><= /p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>Thanx for <st1:City w:st=3D"on"><st1:place = w:st=3D"on">ur</st1:place></st1:City> information and timely help.</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>I have uncommented and tested, even then 40K increase = there for every trap sent.</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>we have not used table in notification, but have one = table in the same MIB for which get,getnext and getbulk is = allowed.</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D3 color=3Dblack face=3D"Times New = Roman"><span style=3D'font-size:12.0pt;color:black'>we have not added any OID to trap = var bind which is defined as/under table.</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>I have noted that memory size is not increasing = beyond 47MB.</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>Initially when started memory size is nearly 8K. I = guess for nearly 1024 traps(1024*40K=3D40M) ,memory usage increases and = after that it is not increasing.</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>I dont why netsnmp_set_row_column() is hit in gdb = while sending the traps. </span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>Thanx,</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>Devi.U</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'><o:p> </o:p></span></font></p> <div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font = size=3D3 face=3D"Times New Roman"><span style=3D'font-size:12.0pt'> <hr size=3D2 width=3D"100%" align=3Dcenter tabIndex=3D-1> </span></font></div> <p class=3DMsoNormal style=3D'margin-bottom:12.0pt'><b><font size=3D2 = face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</spa= n></font></b><font size=3D2 face=3DTahoma><span = style=3D'font-size:10.0pt;font-family:Tahoma'> santhosh.sundarasamy@wipro.com = [mailto:santhosh.sundarasamy@wipro.com]<br> <b><span style=3D'font-weight:bold'>Sent:</span></b> Fri 3/30/2007 4:24 = PM<br> <b><span style=3D'font-weight:bold'>To:</span></b> Devi U; = <st1:PersonName = w:st=3D"on">net-snmp-coders@lists.sourceforge.net</st1:PersonName><br> <b><span style=3D'font-weight:bold'>Subject:</span></b> RE: how to = purify net-snmp code</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D2 color=3Dblue face=3D"Book = Antiqua"><span style=3D'font-size:11.0pt;font-family:"Book = Antiqua";color:blue'>Devi,</span></font><o:p></o:p></p> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 color=3Dblue face=3D"Book = Antiqua"><span style=3D'font-size:11.0pt;font-family:"Book = Antiqua";color:blue'>   ; &nbs= p; Please find my inline comments.</span></font><o:p></o:p></p> <div> <p class=3Dsection1><font size=3D2 color=3Dblue face=3D"Book = Antiqua"><span style=3D'font-size:11.0pt;font-family:"Book = Antiqua";color:blue'>Regards, <br> Santhosh </span></font><o:p></o:p></p> </div> <div> <div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font = size=3D3 face=3D"Times New Roman"><span style=3D'font-size:12.0pt'> <hr size=3D2 width=3D"100%" align=3Dcenter tabIndex=3D-1> </span></font></div> <p class=3DMsoNormal><b><font size=3D2 face=3DTahoma><span = style=3D'font-size:10.0pt; font-family:Tahoma;font-weight:bold'>From:</span></font></b><font = size=3D2 face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'> Devi = U [mailto:<st1:PersonName w:st=3D"on">udevi@TechMahindra.com</st1:PersonName>] <br> <b><span style=3D'font-weight:bold'>Sent:</span></b> Friday, March 30, = 2007 3:22 PM<br> <b><span style=3D'font-weight:bold'>To:</span></b> SANTHOSH S (WT01 - = Broadband Networks); <st1:PersonName = w:st=3D"on">net-snmp-coders@lists.sourceforge.net</st1:PersonName><br> <b><span style=3D'font-weight:bold'>Subject:</span></b> RE: how to = purify net-snmp code</span></font><o:p></o:p></p> </div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> <div id=3DidOWAReplyText47319> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> </div> <div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>Hi,</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>Very Sorry for my late reply. I was assigned to other = works and back to this problem now.</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>after freeing varbind, memory usage was not = reduced.</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>we are sending traps only and traps are received = properly in management system configured.(Verified thro' Advent Net Manager = - Trap viewer)</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>I have cross verified with other implementations and = i cant find any problem in our implementation.</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>Using gdb , I have identified that out of 40 K = </span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>1. 8K is increased in method - = </span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'> agent/agent_trap.c - send_trap_to_sess(netsnmp_session * sess, netsnmp_pdu = *template_pdu)</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'> we are using net-snmp version 5.3.0.1 = and line 881 /* snmp_free_pdu(pdu); */ is commented.</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'> In net-snmp version 5.4 it is = uncommented.</span></font><o:p></o:p></p> <p class=3DMsoNormal><font size=3D2 color=3Dblue face=3D"Book = Antiqua"><span style=3D'font-size:11.0pt;font-family:"Book = Antiqua";color:blue'>[Santhosh] we used 5.2.1. This might be the issue, Uncomment snmp_free_pdu() in = 5.3.0.1 and verify.</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>2. 32 K ( increasing by 8 K for every call,this = method is called in for loop ) is increased in method - = </span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'> agent/helpers/table_dataset.c - netsnmp_set_row_column(netsnmp_table_row *row, unsigned int column,<br> &n bsp; &= nbsp; &nb sp; &n bsp; &= nbsp; &nb sp; int type, const char *value, size_t = value_len)</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'> I doubt whether memory = allocated and pointed to by row is freed or not.</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'> </span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>Code flow to netsnmp_set_row_column = </span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>#0 netsnmp_set_row_column (row=3D0x187a8b8, = column=3D3, type=3D2, value=3D0xffbfeb74 "", value_len=3D4)<br> at table_dataset.c:1224<br> #1 0xff2c226c in log_notification (pdu=3D0x181dfa8, = transport=3D0x3408)<br> at notification-log-mib/notification_log.c:687<br> #2 0xff2bcc0c in send_notifications (major=3D2136456, minor=3D7, serverarg=3D0x2ffd08,<br> clientarg=3D0xff304fe8) at = notification/snmpNotifyTable.c:260<br> #3 0xff15ace0 in snmp_call_callbacks (major=3D1, minor=3D7, caller_arg=3D0x2ffd08) at callback.c:323<br> #4 0xff3688b0 in netsnmp_send_traps (trap=3D-1, specific=3D-1, enterprise=3D0xff392a64,<br> enterprise_length=3D10, vars=3D0x2209320, = context=3D0x0, flags=3D0) at agent_trap.c:783<br> #5 0xff3689d0 in send_enterprise_trap_vars (trap=3D-1, = specific=3D-1, enterprise=3D0xff392a64,<br> enterprise_length=3D10, vars=3D0x2209320) at = agent_trap.c:797<br> #6 <strong><b><font face=3DArial><span = style=3D'font-family:Arial'>0xff29d0bc in send_eventTrap_trap () at ssg/ssg.c:1349 <------ Here = we called send_v2trap</span></font></b></strong><b><span = style=3D'font-weight:bold'><br> </span></b>#7 0xff15d940 in run_alarms () at snmp_alarm.c:251 </span></font><o:p></o:p></p> <p class=3DMsoNormal><font size=3D2 color=3Dblue face=3D"Book = Antiqua"><span style=3D'font-size:11.0pt;font-family:"Book = Antiqua";color:blue'>[Santhosh] Are you adding any OID to trap var bind which is defined as/under table? = To isolate the issue remove table varbinds in trap PDU and see the memory = usage. </span></font><o:p></o:p></p> <p class=3DMsoNormal><font size=3D2 color=3Dblue face=3D"Book = Antiqua"><span style=3D'font-size:11.0pt;font-family:"Book Antiqua";color:blue'>If with = out any table OID added in the trap memory size reduced, then the issue is with = the dataset (you might have used mib2c.create-dataset.conf template to = implement your private table). </span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>Thanx,</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>Devi.U</span></font><o:p></o:p></p> </div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> <div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font = size=3D3 face=3D"Times New Roman"><span style=3D'font-size:12.0pt'> <hr size=3D2 width=3D"100%" align=3Dcenter tabIndex=3D-1> </span></font></div> <p class=3DMsoNormal style=3D'margin-bottom:12.0pt'><b><font size=3D2 = face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</spa= n></font></b><font size=3D2 face=3DTahoma><span = style=3D'font-size:10.0pt;font-family:Tahoma'> santhosh.sundarasamy@wipro.com = [mailto:santhosh.sundarasamy@wipro.com]<br> <b><span style=3D'font-weight:bold'>Sent:</span></b> Wed 3/14/2007 12:08 = PM<br> <b><span style=3D'font-weight:bold'>To:</span></b> Devi U; = <st1:PersonName = w:st=3D"on">net-snmp-coders@lists.sourceforge.net</st1:PersonName><br> <b><span style=3D'font-weight:bold'>Subject:</span></b> RE: how to = purify net-snmp code</span></font><o:p></o:p></p> </div> <div> <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span = style=3D'font-size: 12.0pt'> <o:p></o:p></span></font></p> <p><font size=3D2 face=3D"Times New Roman"><span = style=3D'font-size:10.0pt'>Devi,<br> After freeing varbind, usage = should decrease; PDU is already freed in netsnmp_send_traps() itself ( invoked = by send_v2trap). Sending trap or inform? Are you receiving the traps in trapd? Cross check the API usage in other implementations (grep send_v2trap `find . -name "*.c"`)<br> <br> We used method similar to apps/snmptrap.c and there is no memory usage raised / leaks. Pls refer snmptrap.c file for session creation & deletion.<br> <br> -<br> Santhosh<br> <br> ________________________________________<br> From: Devi U [<a = href=3D"mailto:udevi@TechMahindra.com">mailto:udev i@TechMahindra.com</a>]= <br> Sent: Tuesday, March 13, 2007 7:30 PM<br> To: SANTHOSH S (WT01 - Broadband Networks); <st1:PersonName = w:st=3D"on">net-snmp-coders@lists.sourceforge.net</st1:PersonName><br> Subject: RE: how to purify net-snmp code<br> <br> <br> Santhosh,<br> <br> Thanx for <st1:City w:st=3D"on"><st1:place = w:st=3D"on">ur</st1:place></st1:City> immediate response.<br> followed the same example - /examples/notification.c<br> <br> snmp_free_varbind is called in our code after send_v2trap().<br> <br> In top output, i can see the size remains same even after = snmp_free_varbind() is called.should size decrease after free is called?<br> <br> For every 100 msec, callback will be called,snmp_varlist_add_variable() = is used to store the variables and send_v2trap() is called for sending = a single trap.<br> <br> I dont know how to create session / send all traps in a single = session.<br> <br> Thanx,<br> Devi.U<br> ________________________________________<br> From: santhosh.sundarasamy@wipro.com [<a href=3D"mailto:santhosh.sundarasamy@wipro.com">mai lto:santhosh.sundarasam= y@wipro.com</a>]<br> Sent: Tue 3/13/2007 7:03 PM<br> To: Devi U; <st1:PersonName = w:st=3D"on">net-snmp-coders@lists.sourceforge.net</st1:PersonName><br> Subject: RE: how to purify net-snmp code<br> <br> Hi Devi,<br> The increase shown in top is = memory usage by the application; all increased bytes might have not been = leaked.<br> <br> You need to free the varbinds = after sending each trap/inform.<br> snmp_free_varbind(notification_vars);<br> refer: <a href=3D"http://www.net-snmp.org/dev/agent/notification_8c-example.html">h= ttp://www.net-snmp.org/dev/agent/notification_8c-example.html</a> <br> <br> Print the "top" = output after freeing varbind and check the usage.<br> <br> Are you using single session = to send all trap/inform or creating session before sending each inform/trap?<br> <br> -<br> Santhosh<br> ________________________________________<br> From: Devi U [<a = href=3D"mailto:udevi@TechMahindra.com">mailto:udev i@TechMahindra.com</a>]= <br> Sent: Tuesday, March 13, 2007 6:44 PM<br> To: <st1:PersonName = w:st=3D"on">net-snmp-coders@lists.sourceforge.net</st1:PersonName><br> Cc: SANTHOSH S (WT01 - Broadband Networks)<br> Subject: RE: how to purify net-snmp code<br> <br> Hi,<br> <br> thanx santhosh..<br> I am able to purify the code..<br> <br> I feel that memory leak is there when send_v2trap is called, but i = am not getting any MLK/PLK in traces<br> <br> top display:<br> <br> 26760 root 1 = 0 19 9248K 5608K run 0:01 0.30% snmpd<br> <br> top display after a trap is sent =3D=3D=3D> for each trap sent = there is a increase of 40K in SIZE and goes upto 50M.<br> 26760 root 1 = 0 19 9288K 5648K run 0:01 0.31% snmpd<br> <br> we are using net-snmp version 5.3.0.1.<br> <br> whether above increase in SIZE is memory leak?<br> <br> Thanx,<br> Devi.U<br> <br> <br> The information contained in this electronic message and any attachments = to this message are intended for the exclusive use of the addressee(s) and = may contain proprietary, confidential or privileged information. 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