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Fwd: epoll performance

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On 8/31/06, chima s <chima.s@xxxxxxxxx> wrote:
Hi,

I am using FC2-Linux-2.6.10 Kernel in

dual P4 Xeon Processer
3 GB Physical RAM
2 * 12 GB disked Cache_dir with different SCSI harddisk.
OS File Systen - reiserfs

Squid- 2.6.STABLE2 with
cache_replacement_policy heap LFUDA
memory_replacement_policy heap LFUDA

Server is configured with in bridge mode and tproxy.

Usually when there is 5 MB of traffic squid will use 80 to 90% of CPU
(System load will be 2), after enabling the epoll it come down to 10
to 15% of CPU (System load will be 0.2).

Then i added 5 more MB of traffic the CPU went to 40 to 50% (System
load went to 3). What could be the problem as CPU usage and system
load went high dramatically

sounds to me that you are having lots of disk I/O.
You could use 'top' and watch for processes with 'D' state (column
'S').  iostat / vmstat / sar may confirm that you are having disk I/O.

HTH,

--
Gonzalo A. Arana


--
Gonzalo A. Arana

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