Date: Wed, 31 Aug 2011 02:31:55 +0400 From: Lev Serebryakov <lev@FreeBSD.org> To: Kirk McKusick <mckusick@mckusick.com> Cc: freebsd-fs@freebsd.org Subject: Re: Very inconsistent (read) speed on UFS2 Message-ID: <612137475.20110831023155@serebryakov.spb.ru> In-Reply-To: <201108302009.p7UK9CBQ085481@chez.mckusick.com> References: <317753422.20110830231815@serebryakov.spb.ru> <201108302009.p7UK9CBQ085481@chez.mckusick.com>
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Hello, Kirk. You wrote 31 =E0=E2=E3=F3=F1=F2=E0 2011 =E3., 0:09:12: > memory faster than the cleanup thread can produce it. The result is > that your read idles (e.g., appears to run slowly). It is random because > it depends on when you run out of memory. BTW, it could explain why some runs are slower than other. But my situation looks like opposite: some runs much faster than others. And it could not be read-from-cache if VM is sane. It is hard to belive, that VM will store 0.5GiB of read-once data when another 5GiB was read after that only in 2GiB of physical memory --=20 // Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>
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