RE: [squid-users] Re: Squid 2.6 + COSS comparison

> -----Original Message-----
> From: Joost de Heer [mailto:sanguis@xs4all.nl]
> Sent: Wednesday, 20 September 2006 2:11 AM
> To: Adrian Chadd
> Cc: squid-users@squid-cache.org
> Subject: [squid-users] Re: Squid 2.6 + COSS comparison
>
> Adrian Chadd wrote:
> > Hi everyone,
> >
> > The COSS code in Squid-2.6 has come quite far from its
> original design by
> > Eric Stern. Steven Wilton has put an enormous amount of
> effort into the
> > COSS design to fix the remaining bugs and dramatically improve its
> > performance.
> >
> > I've assembled a quick webpage showing the drop in CPU usage and the
> > negligible effect on hit-rate. Steven Wilton provided the statistics
> > from two Squid caches he administers.
> >
> > You can find it here - http://www.squid-cache.org/~adrian/coss/.
> > Steven is running a recent snapshot of squid-2.6. The latest -STABLE
> > release of Squid-2.6 doesn't incorporate all of the COSS bugfixes
> > (and there's at least one really nasty bug!) so if you're interested
> > in trying COSS out please grab the latest Squid-2.6 snapshot from
> > the website.
>
> The example proxy given has a request rate of about 100 req/s
> max, if I
> understand the graphs correctly. How does COSS hold when the
> request rate
> is significantly higher? I run a proxy that currently seems
> to peak around
> 420 req/s (and has an average rate of about 300 req/s during office
> hours), and am currently using aufs. Mbps peakrate is about
> 25/30 Mbps.
> Anything that can improve the proxy performance even more is
> wanted, since
> I have the feeling that currently the proxy is hitting its
> upper limits.
>

Look further down that page and you'll see there's a second proxy that peaks
around 380 req/sec (5 min average). The cache was performing fine using
aufs, but was looking like it was getting towards its limit (similar to your
setup). The graphs show that the load has dropped significantly since
moving to COSS (There are multiple graphs here which all show a reduced
resource utilisation). We have not had the chance to see how hard we can
push these caches with COSS yet.

Steven

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