From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steven Pratt Subject: Re: dbench regression in 2.6 Date: Fri, 05 Sep 2003 10:24:46 -0500 Message-ID: <3F58AABE.5050800@austin.ibm.com> References: <3F5636F5.4060000@austin.ibm.com> <3F563B3B.6060406@namesys.com> <200309041138.40795.vs@namesys.com> <3F574AEE.7080402@austin.ibm.com> <20030904175853.GB13676@matchmail.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: list-help: list-unsubscribe: list-post: Errors-To: flx@namesys.com In-Reply-To: <20030904175853.GB13676@matchmail.com> List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: Mike Fedyk Cc: Vladimir Saveliev , reiserfs-list@namesys.com Mike Fedyk wrote: >On Thu, Sep 04, 2003 at 09:23:42AM -0500, Steven Pratt wrote: > > >>Vladimir Saveliev wrote: >> >> >> >>>Hi >>> >>>On Wednesday 03 September 2003 23:04, Hans Reiser wrote: >>> >>> >>> >>>>Steven Pratt wrote: >>>> >>>> >>>> >>>>>Is anyone looking into the dbench multitheaded regression in 2.6 that I >>>>>reported here a couple of weeks ago? >>>>> >>>>> >>>>> >>>>> >>>Sorry, I was unable to find your report in mail archives. Could you, >>>please, remind what is the problem? >>> >>>I don't see any change in the >>> >>> >>> >>>>>latest trees. >>>>> >>>>> >>>>> >>>>> >>>>> >>The problem showed up in 2.6.0-test1, and every kernel since. The >>problem is that from 2.5.65 (earliest data I have) to 2.5.69 dbench on >>reiserfs with 16 clients got a throughput of ~200MB/sec. In 2.5.70 >>through 2.5.75 the score went up to ~280MB/sec, a good thing. But in >>2.6.0-test1 the throughput dropped to below 50 MB/sec. Since then it >>has risen slightly but still at only around 60MB/sec. Single client >>dbench showed similar, although much less dramatic changes. No other >>file system exhibited a change in the 2.6.0-test1 kernel so this seems >>to be unique to reiserfs. >> >> > >Did anything change in the testing at all? Can you try again with your >current software versions on 2.5.75, and reproduce the higher speeds? > > No, nothing changed in the test setup. Same dbench, same disk, same distro, just different kernel. >Check the diffstat for the test1 release and see if there are any reiserfs >changes... > I believe that Oleg already said there were no changes that look like they would have caused this. More likely the behavior of something reiser is using changed which is having a bad effect on resierfs. Steve