[squid-users] Some basic Squid questions: mrtg, performance tuning ?

Hi all,

When monitoring the Squid with mrtg, with cacheServerInKb&cacheServerOutKb
variables, I got these output:

Server traffic volume (In/Out):
Max Traffic In 73.7 M b/min Average Traffic In 32.6 M b/min Current
Traffic In 53.4 M b/min
Max Traffic Out 4706.0 k b/min Average Traffic Out 1615.0 k b/min
Current Traffic Out 2574.0 k b/min

What does it mean ? How can the traffic to the cache in 73 Mb/minute while
the traffic out is only about 5 Mb/minute ?

And here is about the HTTP Hits/Requests (cacheHttpHits &
cacheProtoClientHttpRequests):
Max HTTP hits 5260.0 req/min Average HTTP hits 2523.0 req/min Current
HTTP hits 3825.0 req/min
Max HTTP requests 11.2 kreq/min Average HTTP requests 4545.0 req/min
Current HTTP requests 9219.0 req/min
Does my cache server efficient enough ? Is there any performance tuning
guide for using squid with Sun Solaris ? I'm using a Sun 280R with one 900
Mhz cpu, one 36 GB hdd and 2 gb memory. And this is the status of my system:
load averages: 0.41, 0.48, 0.51
CPU states: 0.0% idle, 9.1% user, 13.6% kernel, 77.3% iowait, 0.0% swap

Is there anything abnormal in my system ? Could the system afford more
traffic ?

Many thanks for your help,
Regards,
Aiggno