First step: Check your routing. Even though you can get to your pound server, sometimes if your routing is bad, the return packet gets lost. This happens when you have a drop-in firewall that ARPs a route that is inconsistent with the pound front end. I've done that myself and saw what you are seeing.
Second step: tail -f /var/log/messages --> this will show you the pound activity. Watch this for a day and wait to see if there are any weird pauses in the pound return. Third step: Check your DNS routing. If the pound server is using named resolution of the BE and that name resolution is flakey, then you will see intermittent delays in response. Fourth step: Check your disk. If you have a bad disk, then you will occasionally have an intermittent delay. Listen for clicks on the disk while it is in use. Fifth step: Check other processes that may conflict for CPU priority. Do you have a PCI intense operation going on while inbound connections are processing? Maybe you are using an SSL accelerator that is bad? If pound is waiting for a kernel resource before connecting to the BE then you would get a delay. Run "top" to see if something is taking you CPU or I/O bandwidth. Hope that helps. -- Jake > -----Original Message----- > From: Kaye Ng [mailto:[email protected]] > Sent: Thursday, May 14, 2009 9:36 PM > To: [email protected] > Subject: [Pound Mailing List] Intermittent slow down problems > > Hi, > > I'm running pound version 2.3.1 in production. Each day I seem to be > getting intermittent slowdowns. For example I have a page which > normally > takes 4-5 seconds to load, but on occasion (around 1% of the time) the > page may take up to 250 seconds to load. This slowdown effect is not > restricted to this page, it seems to happen on many different pages > with > varying amounts of data returned. I have checked the apache log and > have > found no evidence that it's apache causing the problem. I also haven't > been able to reproduce this problem - so I'm kinda stuck. > > My setup is as follows: > > Pound server: > - Pound Version: 2.3.1 > - Root Jail: No root jail > - OS: Centos 5.0 > - DNS Version and Type: bind 9.2.4-3.2 > > Back end: > - OS: Centos 4.4 > - Web Server: Apache 2.0.52.28 > > Has anyone else encountered this problem before? I can't seem to > reproduce the slowdown problem, so any ideas and suggestions would be > welcome. > > Thanks for your help. > > Cheers, > Kaye. > > -- > To unsubscribe send an email with subject unsubscribe to > [email protected]. > Please contact [email protected] for questions. -- To unsubscribe send an email with subject unsubscribe to [email protected]. Please contact [email protected] for questions.
