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From Edgar Frank <ef-li...@email.de>
Subject Re: [users@httpd] mod_ssl, erratic performance
Date Thu, 27 Jan 2011 18:23:50 GMT
Am 27.01.2011 16:34, schrieb Matus UHLAR - fantomas:
> On 22.01.11 00:53, john.3.newton@bt.com wrote:
>>
>> We recently moved our production webserver from a sparc platform (T2000)
>> to an x86/64 platform (x2270-m2) and we have noticed an erratic response
>> time for downloads of files using SSL. This seems to randomly occur with
>> any files about 10k or larger. For instance, I have been using a test file
>> of 140K, and it can take 0.5 or 4.8 seconds to transfer. When using the
>> sparc platform, it always only takes 0.5 seconds.
>>
>> I noticed this as we are using an external monitoring system (Gomez.com)
>> and we started seeing these wildly varying times for transaction
>> processing.
>>
>> I have tried a cut down SSL setup for testing, and examined every
>> directive and option, and I can't make sense of the problem. I'm using the
>> following configuration string, and I'd be happy to include the
>> configuration setups..
>>
>> I can move the bare-bones configuration between the sparc and x86
>> platforms and get normal response on the sparc, and irregular on the x86.
>
> random device can make a huge difference. What do you use for random data?
> /dev/random or /dev/urandom? If the rofmer, try the latter if it helps.

Good point. But to have some prove at hand, don't change the random
device yet - instead monitor /proc/sys/kernel/random/entropy_avail with
e.g. watch. If your're going of of random bytes - ka-ching :)

Regards,
Edgar

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