Re: [squid-users] Max throughput of CARP Proxy

Have you done any TCP tuning?

When you say 25% CPU, do you mean 25% of the total of a quad-core box, or 25% of one core? What's the CPU?

Cheers,

On 04/02/2010, at 9:06 PM, Markus Meyer wrote:

> Hi folks,
>
> I'm testing a CARP setup and try to find out what the maximum throughput
> is. After a lot of testing I'm stuck with 5000 req/s and ca. 220 mbit/s
> in and out. Whatever I do I can't make it faster. Does anyone have an
> idea whats going on or if I do something wrong? How can I find out what
> the bottleneck is?
>
> This is the test setup:
>
> - 1 GBit NICs and even faster switches, all servers in the same subnet
> - 1 CARP and 5-9 Proxies as parents
> - all proxies use AUFS and cache_mem
> - proxies are warmed up, meaning I ran the test multiple tests so that
> all content is on the proxies and they don't have to get anything from
> the original servers
> - the CARP does not cache anything(cache_mem 0 MB & cache_dir null no-store)
> - used Version: Squid 2.7.STABLE7-2
> - Kernel is the standard Etch 2.6.18
>
> The test itself:
> I use http_load[1] and start it on four servers at the same time with 50
> parallel requests. It uses a list with appr. 3 mio. URLs with most of
> the files being smaller than 4 kB but bigger than 2 kB. The test runs 30
> minutes.
>
> The CARP uses appr. 25% CPU and has lots of free memory. I get no
> problems reported in cache.log or syslog. And the throughput of 5k req/s
> and 220 mbit/s doesn't change with five, seven or nine parent proxies.
>
>
> [1] http://www.acme.com/software/http_load/http_load-12mar2006.tar.gz
>
>
> Any ideas and hints are welcome.
>
> Cheers, Markus

--
Mark Nottingham       mnot_at_yahoo-inc.com