Date: Fri, 20 Aug 2010 12:48:19 +0200 From: Olivier Smedts <olivier@gid0.org> To: Heinrich Rebehn <rebehn@ant.uni-bremen.de> Cc: freebsd-stable@freebsd.org Subject: Re: ZFS performance question Message-ID: <AANLkTi=a6mG2aJ3GezcPZws2b4V1hryOiUSnVh1sL_qt@mail.gmail.com> In-Reply-To: <EDFF110C-91D3-40DA-A581-9885EAAE3753@ant.uni-bremen.de> References: <EDFF110C-91D3-40DA-A581-9885EAAE3753@ant.uni-bremen.de>
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2010/8/20 Heinrich Rebehn <rebehn@ant.uni-bremen.de>: > Hi all, > > After setting up our new server (Intel Q9550 CPU, 8GB RAM, 4 x ST31000340NS) i did a bonnie++ benchmark on the zfs raidz that i created on 4 partitions on the 4 disks. > > root@antsrv4 [/data/nocompression] # bonnie++ -u root -d . > Using uid:0, gid:0. > Writing a byte at a time...done > Writing intelligently...done > Rewriting...done > Reading a byte at a time...done > Reading intelligently...done > start 'em...done...done...done...done...done... > Create files in sequential order...done. > Stat files in sequential order...done. > Delete files in sequential order...done. > Create files in random order...done. > Stat files in random order...done. > Delete files in random order...done. > Version 1.96 ------Sequential Output------ --Sequential Input- --Random- > Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- > Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP > antsrv4.ant.uni 16G 94 81 151823 39 100780 27 303 99 239853 30 148.3 4 > Latency 4733ms 6051ms 8173ms 37504us 917ms 1030ms > Version 1.96 ------Sequential Create------ --------Random Create-------- > antsrv4.ant.uni-bre -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- > files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP > 16 24183 97 +++++ +++ 21715 98 17209 98 +++++ +++ 21291 97 > Latency 19779us 128us 162us 39671us 38us 77us > 1.96,1.96,antsrv4.ant.uni-bremen.de,1,1282303232,16G,,94,81,151823,39,100780,27,303,99,239853,30,148.3,4,16,,,,,24183,97,+++++,+++,21715,98,17209,98,+++++,+++,21291,97, 733ms,6051ms,8173ms,37504us,917ms,1030ms,19779us,128us,162us,39671us,38us,77us > > > I am somewhat concerned about the numbers for per-char-output and per-char-input. In fact, i have never before seen that low numbers in a bonnie test. Using a single disk with UFS yields about 6 times as much. > > > I know that this is not crucial for a normal file server, but i want to rule out any configuration errors. > > Is this normal for ZFS?. Disks are accessed using ahci. I did not attempt any tuning yet. Can you try without AHCI ? http://www.phoronix.com/scan.php?page=article&item=freebsd_zfs_cam&num=5 > BTW: Running OpenSolaris on the same hardware yields 110306 for per-char-write and 94698 for per-char-read. > > --Heinrich > > > Heinrich Rebehn > > University of Bremen > Physics / Electrical and Electronics Engineering > - Department of Telecommunications - > > Phone : +49/421/218-62394 > Fax : -3341 > > > > > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" > -- Olivier Smedts _ ASCII ribbon campaign ( ) e-mail: olivier@gid0.org - against HTML email & vCards X www: http://www.gid0.org - against proprietary attachments / \ "Il y a seulement 10 sortes de gens dans le monde : ceux qui comprennent le binaire, et ceux qui ne le comprennent pas."
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