From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Liguori Subject: Re: Performance comparaison with dbench on KVM Date: Thu, 24 May 2007 14:16:38 -0500 Message-ID: <4655E496.3080003@codemonkey.ws> References: <46559FDF.5000609@bull.net> <4655A307.3080707@codemonkey.ws> <4655A4BA.5080108@bull.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel To: Laurent Vivier Return-path: In-Reply-To: <4655A4BA.5080108-6ktuUTfB/bM@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org Laurent Vivier wrote: > Anthony Liguori wrote: > > Hi Anthony, > > I didn't modify aio_init limit... > It would be pretty useful to give it a try. In qemu_aio_init() where aio_init() get's called. If you just bump aio_threads and aio_num from 1 to, say, 32. You should see a big difference in SCSI performance. Regards, Anthony Liguori > I made some benchmarks with liposix-aio, but results are worst with IDE and > crashes with SCSI (because I need to make some additional works). > > It's the part on which I work now (to align buffers to avoid redundant buffer > copy and open image disk with O_DIRECT). > > Regards, > Laurent > > ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/