Date: Sat, 27 Aug 2011 19:02:44 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-fs@freebsd.org Subject: Re: Strange behaviour of UFS2+SU FS on FreeBSD 8-Stable: dreadful perofrmance for old data, excellent for new. Message-ID: <j3b7vs$tkd$1@dough.gmane.org> In-Reply-To: <758608837.20110827112116@serebryakov.spb.ru> References: <1963980291.20110826232758@serebryakov.spb.ru> <201108262052.p7QKqpen039191@chez.mckusick.com> <758608837.20110827112116@serebryakov.spb.ru>
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On 27.8.2011. 9:21, Lev Serebryakov wrote: > I'm going to investigate alter, why it is ony ~180MiB/s, when > theoretically it should be about (90*4) 360MiB/s linear read, and whom > to blame: UFS or geom_raid5 or both :) Try this: http://ivoras.net/blog/tree/2010-11-19.ufs-read-ahead.html (or it could be a hardware issue - controller bottleneck or something like that).
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