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Hi all,
I've been scratching my head a bit with a performance issue on a live system
and was wondering if anyone could point me in the right direction for
resolving?
I have a load balancer using 2.4.32 stock kernel running LVS with HTTP &
HTTPS in DR mode with 10 real servers each.
The load balancer is a 2.4GHz Celeron with 512Mb RAM, broadcom gigabit nics.
free -m shows 300MB used + 200MB cached (no swap file)
When the active connections climb to 60,000 and throughput is about 100MB+
we get a sudden and massive drop of in throughput...
We get a corresponding drop in system CPU and increase in Kernel CPU...
I have a selection of graphs here including throughput and cpu usage etc.
http://www.loadbalancer.org/test/
No errors in syslog relating to NICs or netfilter etc.
The actual number of connections is actually about 9K or 11K/sec (Direct
routing exagerating them), I was looking at using ipvsadm --set to reduce
the TCP timeout and therefore connection table size but I don't think that
the memory is an issue.
Any other ideas?
*NB. I've tested similar hardware to 800MB+ and 50K cons/sec (obviously with
small/large packet sizes though not live data)*
Many thanks in advance for any insight :-).
--
Regards,
Malcolm Turnbull.
Loadbalancer.org Ltd.
Phone: +44 (0)870 443 8779
http://www.loadbalancer.org/
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