[squid-users] Is it possible use Squid and virtualization(xen or kvm) have a good performance ?

Hi, everyone!

Last week, we start our plan to migrate all of our application server to the virtualization group. We use Squid as our cache system, we want to use xen as the host and use debian PV as guest.
And the hardware info below:

CPU : Intel(R) Xeon(R) CPU E5506 @ 2.13GHz X 2
memory: 16G

and we gave every debian guest two cores. And 3.7GB memory.
When we start one guest. We saw the performance not so good.

top - 14:53:45 up 3 days, 2:57, 1 user, load average: 0.62, 0.64, 0.84
Tasks: 71 total, 2 running, 69 sleeping, 0 stopped, 0 zombie
%Cpu0 : 1.0 us, 0.7 sy, 0.0 ni, 90.1 id, 0.0 wa, 0.0 hi, 4.8 si, 3.4 st
%Cpu1 : 14.3 us, 15.0 sy, 0.0 ni, 61.2 id, 9.2 wa, 0.0 hi, 0.0 si, 0.3 st
KiB Mem: 3747736 total, 3630068 used, 117668 free, 296244 buffers
KiB Swap: 0 total, 0 used, 0 free, 1821520 cached

root_at_backend4a:~# ifstat -b
       eth0 eth1 eth2 eth3 eth4 eth5 eth6
 Kbps in Kbps out Kbps in Kbps out Kbps in Kbps out Kbps in Kbps out Kbps in Kbps out Kbps in Kbps out Kbps in Kbps out
 8375.12 52575.00 0.44 0.00 4.31 0.00 43416.20 7713.50 0.00 0.00 43.38 31.68 300.96 26.59
 9268.63 51068.23 0.44 0.00 3.73 0.00 40364.53 8733.16 0.00 0.00 13.40 15.26 8.79 12.37
 7685.08 42964.82 0.44 0.00 3.71 0.00 45665.90 7254.55 0.00 0.00 1884.36 72.96 9.17 9.19

U see the cpu use about 40% of the cpu but the traffic is just 3~5MB/s.

This make me doubt does the cache system Squid is suitable for virtualization. Or the bad performance caused by our configuration ? Has anyone use squid in xen can talk about ?
Received on Thu Mar 07 2013 - 07:01:37 MST