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
