>> >> I haven't mentioned it yet, but several times I've seen the website >> >> perform fine all day until I browse to it myself and then all of a >> >> sudden it's super slow for me and my third-party monitor. WTF??? >> > >> > I had a similar problems once when routing through a IPsec VPN tunnnel. >> > I needed to reduce MTU in front of the tunnel to make it work >> > correctly. But I think your problem is different. >> >> I'm not using IPsec or a VPN. >> >> > Does the http server backlog on the other side? Do you have performance >> > graphs for other parts of the system to see them in relation? Maybe >> > some router on the path doesn't work as expected. >> >> I've attached a graph of http response time, CPU usage, and TCP >> queueing over the past week. It seems clear from watching top, iotop, >> and free than my CPU is always the bottleneck on my server. > > I'm going to throw one more tool at you; give atop a try. (htop is nice, too, > but atop is more powerful.)
I think I got it. I'll post all the gory details shortly. - Grant
