Posted by Brent Baisley on 09/14/05 17:46

There are two thing to check in the Apache config to make sure DNS is
not the thing slowing you down.
HostnameLookups defaults to On in Apache2, but defaulted to off in
Apache1. Check that setting.

Also, if you use Allow and Deny directives with domain names, Apache
does a double reverse triple lindy DNS lookup (or something like
that). That would slow things down alot, but not affect ssh, ftp, etc.

Regardless, my guess is it's something with Apache2 that is causing
the slow down. Have you tried Apache1.3 under 10.4? I haven't
experienced any performance slow down under 10.4 using 1.3.


On Sep 14, 2005, at 9:57 AM, Nicolas Ross wrote:

>>> In all cases, it was the same httpd.conf. Of course, from apache
>>> 1 to 2 there where differences, but basicly it's the same.
>>>
>>
>> your description gives the impression that there is a DNS
>> configuration problem...
>> like apache is trying for 5-10 seconds to look something up, fails
>> and then finally
>> decides to run your script.
>>
>> you can test that with a simple script like:
>>
>> <?php /*make sure all outputbuffering is off!*/ for ($i=0;$i <
>> 100000;$i++) { echo "$i<br />"; } ?>
>>
>> chances are it will start outputting after a certain ammount of
>> time rather than right away.
>> that said this is a very simplistic test and my understanding of
>> this stuff is rather limited.
>>
>
> It did occure to me that there maybe a dns issue, but it can't be.
> My tests were done on two separates server rooms. In the second one
> (the one with the xserves), I have 3 computers. All ip config is
> exactly the same (apart from main ip)... And the only non-network
> related difference between the nodes are the OS (10.3 vs 10.4).
>
> Besides, if it were a DNS problem, I would also experience delays
> elswhere, like ssh, ftp an other things network-related.
>
> I did the test, and it started to output immediatly...
>
> Thanks,
>
> Nicolas
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--
Brent Baisley
Systems Architect
Landover Associates, Inc.
Search & Advisory Services for Advanced Technology Environments
p: 212.759.6400/800.759.0577

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