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@xxxxxxxxxxxxx
