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From Jess Holle <je...@ptc.com>
Subject Re: Apache 2.x perf degradation on large downloads on Windows
Date Thu, 28 Sep 2006 21:37:58 GMT
In some of my testing, Win32DisableAcceptEx seems to make a huge 
improvement, however...

Jess Holle wrote:
> Jess Holle wrote:
>> I'm seeing what appears to be really severe performance degradation 
>> during the course of really large downloads (e.g. 800MBs) on Windows 
>> Apache's -- both 2.0.x (recent builds) and 2.2.3.
>>
>> Has anyone else seen this?  Is this just a lack of tuning?  If so, 
>> pointers would be appreciated.
>>
>> Note we're using:
>>
>>     SendBufferSize 16384
>>
>> and
>>
>>     EnableSendfile Off
>>
>> Before blaming the latter setting, however, I should point out that 
>> the problem we're seeing exists both for this case with simple static 
>> file downloads and for dynamic downloads through mod_jk and Tomcat 
>> (we've only tested this case with 2.0.x).  The latter case is 
>> actually our real issue, but unless/until static file downloads don't 
>> show this degradation there seems to be little point in chasing the 
>> (more complex) dynamic case.
> Also the enabling send file does not seem to make any difference to 
> the results.
>
> --
> Jess Holle
>


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