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Date: Fri, 09 Nov 2007 18:34:15 +0100
From: Kris Kennaway <kris@FreeBSD.org>
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To: Alexey Popov <lol@chistydom.ru>
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Cc: freebsd-hackers@freebsd.org, freebsd-stable@freebsd.org
Subject: Re: amrd disk performance drop after running under high load
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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