Apache 1.3 + PHP 5 on FreeBSD 6 -- bad performance under load

[BSD]

Clement Laforet wrote:

>On Wed, Feb 15, 2006 at 04:15:26PM +0000, BSD wrote:
>  
>
>>As you can see, it took 10 seconds to reply to the GET, yet the 
>>accepting of the connection was instant.
>>I have more than enough maxfiles, maxproc, maxfilesperproc, nmbclusters 
>>etc. I guess the connection is so promptly answered because of the http 
>>accept filters built in the kernel.
>>
>>As a final note, the MaxClients I'm using are not nearly enough (around 
>>200 connections/second, according to pfstat graphics vs MaxClients 98). 
>>The reason for this is that trying to match MaxClients with the real 
>>load resulted in two 0.0% idle processors, since the PHP code is a bit 
>>heavy. I've opted to disable KeepAlive and lower MaxClients instead. 
>>Could this be the delay I'm seeing ? I think so, but I need more 
>>opinions, so feel free to reply.
>>    
>>
>
>It looks like requests are stuck in the listen backlog.
>
>clem
>  
>

That is my main suspect too. Is there a way to know how many connections 
are currently on the backlog ?