Re: [us...@httpd] Slow Responses Under Low Load

2010-09-01 Thread Eric Covener
On Wed, Sep 1, 2010 at 3:46 PM, Travis Whitton wrote: > Pretty sure we're hitting up against a concurrency problem. I can > reproduce the issue on a machine that's not in production with very > similar specs by running ab (apache bench) on three hefty client > machines with concurrency set to 1,00

Re: [us...@httpd] Slow Responses Under Low Load

2010-09-01 Thread Travis Whitton
Pretty sure we're hitting up against a concurrency problem. I can reproduce the issue on a machine that's not in production with very similar specs by running ab (apache bench) on three hefty client machines with concurrency set to 1,000 on each machine. Doing some tests serving static content, I c

Re: [us...@httpd] Slow Responses Under Low Load

2010-08-31 Thread Rainer Jung
On 31.08.2010 23:38, Eric Covener wrote: Running `netstat -tapn | grep 80 | wc -l' shows 11299 connections to port 80. We're setup to use prefork with the following configuration. MaxClients1000 Is the netstat output a typo? With MaxClients 1000 and the default ListenBackLog of ~500,

Re: [us...@httpd] Slow Responses Under Low Load

2010-08-31 Thread Eric Covener
> Running `netstat -tapn | grep 80 | wc -l' shows 11299 > connections to port 80. We're setup to use prefork with the following > configuration. > > MaxClients        1000 Is the netstat output a typo? With MaxClients 1000 and the default ListenBackLog of ~500, you should have started refusing co

[us...@httpd] Slow Responses Under Low Load

2010-08-31 Thread Travis Whitton
Hi there, we're having a strange issue and wondering if anyone might have any suggestions. We have a cluster of apache machines and are experiencing a problem where the load average and other hardware metrics are well below normal ranges, but the response times are exceedingly high (even for tiny p