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Date:      Fri, 09 Nov 2007 18:34:15 +0100
From:      Kris Kennaway <kris@FreeBSD.org>
To:        Alexey Popov <lol@chistydom.ru>
Cc:        freebsd-hackers@freebsd.org, freebsd-stable@freebsd.org
Subject:   Re: amrd disk performance drop after running under high load
Message-ID:  <47349A17.3080806@FreeBSD.org>
In-Reply-To: <47344E47.9050908@chistydom.ru>
References:  <47137D36.1020305@chistydom.ru> <47140906.2020107@FreeBSD.org> <47146FB4.6040306@chistydom.ru> <47147E49.9020301@FreeBSD.org> <47149E6E.9000500@chistydom.ru> <4715035D.2090802@FreeBSD.org> <4715C297.1020905@chistydom.ru> <4715C5D7.7060806@FreeBSD.org> <471EE4D9.5080307@chistydom.ru> <4723BF87.20302@FreeBSD.org> <47344E47.9050908@chistydom.ru>

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Alexey Popov wrote:
> Hi.
> 
> Kris Kennaway wrote:te:
> 
>> In the "good" case you are getting a much higher interrupt rate but 
>> with the data you provided I can't tell where from.  You need to run 
>> vmstat -i at regular intervals (e.g. every 10 seconds for a minute) 
>> during the "good" and "bad" times, since it only provides counters and 
>> an average rate over the uptime of the system.
> 
> Now I'm running 10-process lighttpd and the problem became no so big.
> 
> I collected interrupt stats and it shows no relation beetween 
> ionterrupts and slowdowns. Here is it:
> http://83.167.98.162/gprof/intr-graph/
> 
> Also I have similiar statistics on mutex profiling and it shows there's 
> no problem in mutexes. http://83.167.98.162/gprof/mtx-graph/mtxgifnew/
> 
> I have no idea what else to check.
> 
> With best regards,
> Alexey Popov
> 
> 

I don't know what this graph is showing me :)  When precisely is the 
system behaving poorly?

Kris
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