Date: Wed, 17 Jun 2009 11:11:10 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Dan Naumov <dan.naumov@gmail.com> Cc: freebsd-fs@freebsd.org, FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: ZFS performance on 7.2-release/amd64 low compared to UFS2 + SoftUpdates Message-ID: <20090617161109.GA12966@dan.emsphone.com> In-Reply-To: <cf9b1ee00906170034q1cee4581hb518f53e9f368368@mail.gmail.com> References: <cf9b1ee00906170034q1cee4581hb518f53e9f368368@mail.gmail.com>
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In the last episode (Jun 17), Dan Naumov said: > I am wondering if the numbers I am seeing is something expected or is > something broken somewhere. Output of bonnie -s 1024: > > on UFS2 + SoftUpdates: > > -------Sequential Output-------- ---Sequential Input-- --Random-- > -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks--- > Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU > 1024 56431 94.5 88407 38.9 77357 53.3 64042 98.6 644511 98.6 23603.8 243.3 The insane sequential input K/sec and random seeks/sec values indicate that your entire test file was cached in memory. Try a larger file (at least 2x your installed RAM). > on ZFS: > > -------Sequential Output-------- ---Sequential Input-- --Random-- > -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks--- > Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU > 1024 22591 53.7 45602 35.1 14770 13.2 45007 83.8 94595 28.0 102.2 1.2 > -- Dan Nelson dnelson@allantgroup.com
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