Date: Sat, 24 Jul 2010 23:58:42 -0400 From: Dan Langille <dan@langille.org> To: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: gpart -b 34 versus gpart -b 1024 Message-ID: <4C4BB672.3090109@langille.org> In-Reply-To: <4C4BA50B.6050507@langille.org> References: <4C4BA50B.6050507@langille.org>
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On 7/24/2010 10:44 PM, Dan Langille wrote: > You may have seen my cunning plan: > http://docs.freebsd.org/cgi/getmsg.cgi?fetch=883310+0+current/freebsd-stable > > > I've been doing some testing today. The first of my tests comparing > partitions aligned on a 4KB boundary are in. I created a 5x2TB zpool, > each of which was set up like this: > > gpart add -b 1024 -s 3906824301 -t freebsd-zfs -l disk01 ada1 > or > gpart add -b 34 -s 3906824301 -t freebsd-zfs -l disk01 ada1 > > Repeat for all 5 HDD. And then: > > zpool create storage raidz2 gpt/disk01 gpt/disk02 gpt/disk03 gpt/disk04 > gpt/disk05 > > Two Bonnie-64 tests: > > First, with -b 34: > > # ~dan/bonnie-64-read-only/Bonnie -s 5000 > File './Bonnie.12315', size: 5242880000 > Writing with putc()...done > Rewriting...done > Writing intelligently...done > Reading with getc()...done > Reading intelligently...done > Seeker 1...Seeker 2...Seeker 3...start 'em...done...done...done... > -------Sequential Output-------- ---Sequential Input-- --Random-- > -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks--- > GB M/sec %CPU M/sec %CPU M/sec %CPU M/sec %CPU M/sec %CPU /sec %CPU > 5 110.6 80.5 115.3 15.1 60.9 8.5 68.8 46.2 326.7 15.3 469 1.4 > > > > > And then with -b 1024 > > # ~dan/bonnie-64-read-only/Bonnie -s 5000 > File './Bonnie.21095', size: 5242880000 > Writing with putc()...done > Rewriting...^[[1~done > Writing intelligently...done > Reading with getc()...done > Reading intelligently...done > Seeker 1...Seeker 2...Seeker 3...start 'em...done...done...done... > -------Sequential Output-------- ---Sequential Input-- --Random-- > -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks--- > GB M/sec %CPU M/sec %CPU M/sec %CPU M/sec %CPU M/sec %CPU /sec %CPU > 5 130.9 94.2 118.3 15.6 61.1 8.5 70.1 46.8 241.2 12.7 473 1.4 > > > My reading of this: All M/sec rates are faster except sequential input. > Comments? > > I'll run -s 20000 and -s 50000 tests overnight and will post them in the > morning. Well, it seems I'm not sleeping yet, so: -b 34 -------Sequential Output-------- ---Sequential Input-- --Random-- -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks--- GB M/sec %CPU M/sec %CPU M/sec %CPU M/sec %CPU M/sec %CPU /sec %CPU 50 113.1 82.4 114.6 15.2 63.4 8.9 72.7 48.2 142.2 9.5 126 0.7 -b 1024 -------Sequential Output-------- ---Sequential Input-- --Random-- -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks--- GB M/sec %CPU M/sec %CPU M/sec %CPU M/sec %CPU M/sec %CPU /sec %CPU 50 110.5 81.0 112.8 15.0 62.8 9.0 72.9 48.5 139.7 9.5 144 0.9 Here, the results aren't much better either... am I not aligning this partition correctly? Missing something else? Or... are they both 4K block aligned? -- Dan Langille - http://langille.org/
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