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Date: Thu, 06 Mar 2003 15:43:51 +0100
From: Laurent Blume <laurent.blume@infores.com>
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Subject: Re: [users@httpd] Delivering empty content? Why?

> And still, yes! I am wondering why the pages are being whipped.
> But you are helping with your post... So, basically are you saying that 
> I should expect this when using AV software? Maybe it is F-Secure after 
> all...
> 

Yes, because basically, what AV software does, intercepting a try to 
open a file, reading and checking it, and then sending it to the process 
that is trying to access it.
Normally, the AV software is running as a more privileged user (usually 
SYSTEM on Windows), so it has priority on a normal user process.
But here, you have two processes belonging to SYSTEM, Apache and FSAV, 
fighting to open and read a file first.
The least that can happen is severe perormance degradation (I had that 
problem with Norton AV on a development Win2000 Apache server, until I 
disabled it).

What you can try to do is tweak the configuration of FSAV. For example, 
avoiding any check on Apache subdirs, or HTML files, or check only on 
writing a file, not for a simple read.

You should be aware that those end-user AV software are *not* made to be 
used on a server, there are different versions for that (I spent a while 
working on FSAV in a distributed environment, with production servers 
and desktops clients).

HTH,

Laurent
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