Date: Wed, 31 Aug 2011 02:29:33 +0400 From: Lev Serebryakov <lev@FreeBSD.org> To: Kirk McKusick <mckusick@mckusick.com>, freebsd-fs@freebsd.org Subject: Re: Very inconsistent (read) speed on UFS2 Message-ID: <1693072185.20110831022933@serebryakov.spb.ru> In-Reply-To: <103666698.20110831021404@serebryakov.spb.ru> References: <317753422.20110830231815@serebryakov.spb.ru> <201108302009.p7UK9CBQ085481@chez.mckusick.com> <103666698.20110831021404@serebryakov.spb.ru>
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Hello, Kirk. You wrote 31 =E0=E2=E3=F3=F1=F2=E0 2011 =E3., 2:14:04: > I'll try this experiment with mmap() and touching every 4096-th byte of > mapped memory instead of read(2). Strange enough, it gives only 40-50MiB/s and results are very consistent. It really surprise me. I didn't think, that there will be so much difference, I was sure, that it will be almost equivalent speed. --=20 // Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>
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