Network performance in a dual CPU system

Marcos Bedinelli bedinelli at madhaus.cns.utoronto.ca
Fri Feb 10 05:46:04 PST 2006


Hello all,

We have a 2.4GHz Intel Xeon machine running FreeBSD 6.0-RELEASE-p2. Due 
to heavy network traffic, CPU utilization on that machine is 100%:

===

mull [~]$top -S
last pid: 94989;  load averages:  3.69,  4.02,  4.36           up 
25+07:21:34  14:51:43
105 processes: 2 running, 46 sleeping, 57 waiting
CPU states:  0.0% user,  0.0% nice,  0.3% system, 99.4% interrupt,  
0.3% idle
Mem: 20M Active, 153M Inact, 84M Wired, 4K Cache, 60M Buf, 237M Free
Swap: 999M Total, 999M Free

   PID USERNAME   THR PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND
    60 root         1 -44 -163     0K     8K WAIT   355.6H 72.17% swi1: 
net
    39 root         1 -68 -187     0K     8K WAIT    52.3H  5.22% irq28: 
bge0
    40 root         1 -68 -187     0K     8K WAIT    28.3H  2.25% irq29: 
bge1
    11 root         1 171   52     0K     8K RUN    166.6H  0.00% idle
    63 root         1 -16    0     0K     8K -      121:55  0.00% yarrow
    61 root         1 -32 -151     0K     8K WAIT    46:21  0.00% swi4: 
clock sio
[...]

===


Does anyone know whether a dual CPU system can help us improve the 
situation? I was wondering if the software interrupt threads would be 
divided between the two processors.

Any help/insight is greatly appreciated

Thanks!

--
Marcos Bedinelli



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