Hi,
I'm new to jabberd2, and am having some performance problems when
moving mysql to an separate machine.
I installed jabberd-2.14 on the same machine as mysql 5.0, such that
jabberd2 communicates with mysql via the unix /tmp/mysql.sock. Things
are running nice and fast, load testing using Tsung easily gets over
3500 concurrent users.
I changed the sm.xml configuration to use an IP rather than
localhost, and suddenly there is a huge drop in performance. I can't
get more than a couple hundred concurrent users.
When I monitor mysql ("mysqladmin extended"), it's only handling
about 40 queries per second when using TCP, whereas with the unix
socket it handles thousands per second. If I look at vmstat, with
mysql unix socket, there is 0% iowait, but with mysql tcp connection
vmstat is at 25% (more specifically: 100% on 1 of 4 CPUs).
I've run the mysql benchmarking programs and performance is nearly
the same with TCP or unix socket, which suggests to me there's
something wrong with my jabberd setup.
Any suggestions as to what might be going on?
thanks!
- Michiel
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