From mboxrd@z Thu Jan 1 00:00:00 1970 From: Suparna Bhattacharya Subject: aio-stress throughput regressions from 2.6.11 to 2.6.12 Date: Fri, 1 Jul 2005 13:26:00 +0530 Message-ID: <20050701075600.GC4625@in.ibm.com> Reply-To: suparna@in.ibm.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-kernel@vger.kernel.org Return-path: To: linux-aio@kvack.org, linux-fsdevel@vger.kernel.org Content-Disposition: inline Sender: owner-linux-aio@kvack.org List-Id: linux-fsdevel.vger.kernel.org Has anyone else noticed major throughput regressions for random reads/writes with aio-stress in 2.6.12 ? Or have there been any other FS/IO regressions lately ? On one test system I see a degradation from around 17+ MB/s to 11MB/s for random O_DIRECT AIO (aio-stress -o3 testext3/rwfile5) from 2.6.11 to 2.6.12. It doesn't seem filesystem specific. Not good :( BTW, Chris/Ben, it doesn't look like the changes to aio.c have had an impact (I copied those back to my 2.6.11 tree and tried the runs with no effect) So it is something else ... Ideas/thoughts/observations ? Regards Suparna -- Suparna Bhattacharya (suparna@in.ibm.com) Linux Technology Center IBM Software Lab, India -- To unsubscribe, send a message with 'unsubscribe linux-aio' in the body to majordomo@kvack.org. For more info on Linux AIO, see: http://www.kvack.org/aio/ Don't email: aart@kvack.org