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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