RE: [squid-users] Squid Performance (with Polygraph)

Hi all,
        Okay I've done some of what you requested, and unfortunately failed
to find anything specific. I can pretty much guarantee the times at which
the requests will slow down now. 600RPS = 15 minutes, 800 RPS = 11 minutes,
400 RPS = ~80 minutes.

During that time (before and during the problem) systat -vmstat 1 shows the
same interrupts - about 4000 on em1 (ifac) and 250 on hptmv0 - my controller
for the SATA drives.

If I use a systat -iostat 1 I can see that none of the drives are 100%
utilized at any time during the test. Systat -tcp 1 also doesn't show me
anything out of the ordinary. I have setup munin to monitor the host but
unfortunately its not showing much.

Also the problem is that when the problem begins, it starts filling up
network connections - once it fills all the available ports nothing can
monitor it :/

I'm going to try use a different network card, then a different motherboard
etc - try some different setups today. Thanks again for all the help and
please let me know if anyone has any ideas...

Thanks
Dave

-----Original Message-----
From: Adrian Chadd [mailto:adrian@creative.net.au]
Sent: Friday, November 09, 2007 4:08 AM
To: Dave Raven
Cc: squid-users@squid-cache.org
Subject: Re: [squid-users] Squid Performance (with Polygraph)

On Thu, Nov 08, 2007, Dave Raven wrote:
> Hi Adrian,
> What would cause it to fail after a specific time though - if the
cache_mem
> is already full and its using the drives? I would have thought it would
fail
> immediately ?
>
> Also there are no log messages about failures or anything...

Who knows :) its hard without having remote access, or lots of logging/
statistics to correlate the trouble times with.

Try installing munin and graph all the system-specific stuff. See what
correlates against the failure time. You might notice something, like
out of memory/paging, or an increase in interrupts, or something. ;)

Thats all I can offer at the present time, sorry.

Adrian

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