From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?ISO-8859-1?Q?S=E9bastien_Dugu=E9?= Subject: Re: aio-stress throughput regressions from 2.6.11 to 2.6.12 Date: Mon, 11 Jul 2005 09:43:06 +0200 Message-ID: <1121067786.2196.62.camel@frecb000686> References: <20050701075600.GC4625@in.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Return-path: To: suparna@in.ibm.com In-Reply-To: <20050701075600.GC4625@in.ibm.com> Sender: owner-linux-aio@kvack.org List-Id: linux-fsdevel.vger.kernel.org On Fri, 2005-07-01 at 13:26 +0530, Suparna Bhattacharya wrote: > 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 ? >=20 > 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 :( >=20 > 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 eff= ect) > So it is something else ... >=20 > Ideas/thoughts/observations ? >=20 > Regards > Suparna >=20 I'm too seeing a regression, but between 2.6.10 and 2.6.12 and using sysbench + MySQL (with POSIX AIO). The difference is roughly 8% slower for 2.6.12. I'm currently trying to trace it. aio-stress shows no difference so it probably does not come from kernel AIO. S=E9bastien. --=20 ------------------------------------------------------ S=E9bastien Dugu=E9 BULL/FREC:B1-247 phone: (+33) 476 29 77 70 Bullcom: 229-7770 mailto:sebastien.dugue@bull.net Linux POSIX AIO: http://www.bullopensource.org/posix =20 ------------------------------------------------------ -- 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