Duplex problems with NFS mounts

I am running Suse 9.0 with Kernel 2.4.24, whith a IBM Opteron Box, internal
10 / 100 / 1000 Meg Broadcom ethernet. Whenever I enable full duplex at 100
Meg I take HUGE errors while connected to a Cisco 6505 Switch. If I set up
for auto auto, it negotiates to 100 Half Duplex and seems to be stable. Anyone
run into any similar problems ?


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Swordsman <drswordsman@msn.com> wrote:
>
> I am running Suse 9.0 with Kernel 2.4.24, whith a IBM Opteron Box, internal
> 10 / 100 / 1000 Meg Broadcom ethernet. Whenever I enable full duplex at 100
> Meg I take HUGE errors while connected to a Cisco 6505 Switch. If I set up
> for auto auto, it negotiates to 100 Half Duplex and seems to be stable. Anyone
> run into any similar problems ?

Sounds like the switch is forced to 100 half, so when you force your end to
full duplex, you pretty much break networking. Read
http://www.scyld.com/expert/NWay.html and be enlightened.

--
Frank Sweetser fs at wpi.edu
WPI Network Engineer

Thanks Frank,
I have read that article quite a while ago. Its not as easy as that, I now
have control over the switch to confirm its configuration and Full Duplex
breaks performance by a 4 order of magnatude.

Frank Sweetser <fs@erwin.wpi.edu> wrote:
>Swordsman <drswordsman@msn.com> wrote:
>>
>> I am running Suse 9.0 with Kernel 2.4.24, whith a IBM Opteron Box, internal
>> 10 / 100 / 1000 Meg Broadcom ethernet. Whenever I enable full duplex at
100
>> Meg I take HUGE errors while connected to a Cisco 6505 Switch. If I set
up
>> for auto auto, it negotiates to 100 Half Duplex and seems to be stable.
Anyone
>> run into any similar problems ?
>
>Sounds like the switch is forced to 100 half, so when you force your end
to
>full duplex, you pretty much break networking. Read
>http://www.scyld.com/expert/NWay.html and be enlightened.
>
>--
>Frank Sweetser fs at wpi.edu
>WPI Network Engineer



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Michael <drswordsman@msn.com> wrote:
>
> Thanks Frank,
> I have read that article quite a while ago. Its not as easy as that, I now
> have control over the switch to confirm its configuration and Full Duplex
> breaks performance by a 4 order of magnatude.

Okay, troubleshooting time then.

- are both ends configured for autonegotiation?

- you said you verified that the host autonegotiates to 100 half. what
does the switch side negotiate to?

- when full duplex, does either end start racking up lots of collisions or
errors?

- does the switch even support full duplex?

--
Frank Sweetser fs at wpi.edu
WPI Network Engineer

Frank Sweetser <fs@erwin.wpi.edu> wrote:

> Okay, troubleshooting time then.

....

What does mii-tool tell you?

--
Cameron Kerr
cameron.kerr@paradise.net.nz : http://nzgeeks.org/cameron/
Empowered by Perl!

mii-tool and ethertool both report proper 100 Full


Cameron Kerr <cameron.kerr@paradise.net.nz> wrote:
>Frank Sweetser <fs@erwin.wpi.edu> wrote:
>
>> Okay, troubleshooting time then.
>
>....
>
>What does mii-tool tell you?
>
>--
>Cameron Kerr
>cameron.kerr@paradise.net.nz : http://nzgeeks.org/cameron/
>Empowered by Perl!



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See Notes Below:

Frank Sweetser <fs@erwin.wpi.edu> wrote:
>Michael <drswordsman@msn.com> wrote:
>>
>> Thanks Frank,
>> I have read that article quite a while ago. Its not as easy as that, I
now
>> have control over the switch to confirm its configuration and Full Duplex
>> breaks performance by a 4 order of magnatude.
>
>Okay, troubleshooting time then.
>
> - are both ends configured for autonegotiation?

Yes they are, I have tried both, Switch auto and Linux hard, Switch hard
and Linux auto

>
> - you said you verified that the host autonegotiates to 100 half. what
> does the switch side negotiate to?
>

100 Half

> - when full duplex, does either end start racking up lots of collisions
or
> errors?
>
Yes Huge Collisions and CRC's

> - does the switch even support full duplex?
>

Yes Cisco 3550 XL 48 Port

>--
>Frank Sweetser fs at wpi.edu
>WPI Network Engineer



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Michael <drswordsman@msn.com> wrote:
>> - when full duplex, does either end start racking up lots of collisions
> or
>> errors?
>>
> Yes Huge Collisions and CRC's

Well, then there you go. Whichever end is getting collisions is *not* at
full duplex. Half duplex at one end and full duplex at the other produces
exactly those kinds of results.

--
Frank Sweetser fs at wpi.edu
WPI Network Engineer

On Thu, 26 Feb 2004 12:33:38 -0600, Michael wrote:

> Yes they are, I have tried both, Switch auto and Linux hard, Switch hard
> and Linux auto

I'm not trying to be facetious here but have you "tried switch auto and
linux auto" or Switch hard and Linux hard"? 'Cos that's the only way its
gonna work.

--
David Haggett
Linux user since 01/01/2003
Email: david<at>haggett<dot>demon<dot>co<dot>uk

On Wed, 25 Feb 2004 16:14:28 -0600, Swordsman wrote:

>
> I am running Suse 9.0 with Kernel 2.4.24, whith a IBM Opteron Box, internal
> 10 / 100 / 1000 Meg Broadcom ethernet. Whenever I enable full duplex at 100
> Meg I take HUGE errors while connected to a Cisco 6505 Switch. If I set up
> for auto auto, it negotiates to 100 Half Duplex and seems to be stable. Anyone
> run into any similar problems ?
>
Auto-negotiation is somewhat problematic. Sounds like the switch port is
set to auto-negotiate but isn't able to do so and 100-half is the happy
medium.

You'll need to force matching duplex and speed on both sides (PC and
switch) and then monitor for errors.

Saundo

--
Chris "Saundo" Saunderson saundo@earthlink.net
Unix/CCNA/CCDA Guy Powered by Linux and the Orb.