[gentoo-user] TCP Queuing problem

[Grant <emailgrant@gmail.com>]

My web server's response time for http requests skyrockets every
weekday between about 9am and 5pm.  I've gone over my munin graphs and
the only one that really correlates well with the slowdown is "TCP
Queuing".  It looks like I normally have about 400 packets per second
graphed as "direct copy from queue" in munin throughout the day, but 2
to 3.5 times that many are periodically graphed during work hours.  I
don't see the same pattern at all from the graph of all traffic on my
network interface which actually peaks over the weekend.  TCP Queuing
doesn't rise above 400 packets per second all weekend.  This is
consistent week after week.

My two employees come into work during the hours in question, and they
certainly make frequent requests of the web server while at work, but
if their volume of requests were the cause of the problem then that
would be reflected in the graph of web server requests but it is not.
I do run a small MTU on the systems at work due to the config of the
modem/router we have there.

Is this a recognizable problem to anyone?

- Grant