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Date: Fri, 09 Nov 2007 15:10:47 +0300
From: Alexey Popov <lol@chistydom.ru>
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To: Kris Kennaway <kris@FreeBSD.org>
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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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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