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Date: Mon, 27 Oct 2008 14:39:28 -0400
From: =?ISO-8859-1?Q?Francis_Dub=E9?= <freebsd@optiksecurite.com>
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To: freebsd-questions@freebsd.org
Subject: collecting pv entries -- suggest increasing PMAP_SHPGPERPROC
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Hi everyone,

I'm running a a webserver on FreeBSD (6.2-RELEASE-p6) and I have this 
error in my logs :

collecting pv entries -- suggest increasing PMAP_SHPGPERPROC

I've read that this is mainly caused by Apache spawning too many 
processes. Everyone seems to suggest to decrease the MaxClients 
directive in Apache(set to 450 at the moment), but here's the 
problem...i need to increase it ! During peaks all the processes are in 
use, we even have little drops sometime because there isn't enough 
processes to serve the requests. Our traffic is increasing slowly over 
time so i'm affraid that it'll become a real problem soon. Any tips on 
how I could deal with this situation, Apache's or FreBSD's side ?

Here's the useful part of my conf :

Apache/2.2.4, compiled with prefork mpm.
httpd.conf :
[...]
<IfModule mpm_prefork_module>
    ServerLimit         450
    StartServers          5
    MinSpareServers       5
    MaxSpareServers      10
    MaxClients          450
    MaxRequestsPerChild   0
</IfModule>

KeepAlive On
KeepAliveTimeout 15
MaxKeepAliveRequests 500
[...]


Francis Dube
R&D
Optik Securite
www.optiksecurite.com