From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sfi-mx-3.v28.ch3.sourceforge.com ([172.29.28.123] helo=mx.sourceforge.net) by h25xhf1.ch3.sourceforge.com with esmtp (Exim 4.69) (envelope-from ) id 1KmqBI-0003Ob-UW for user-mode-linux-devel@lists.sourceforge.net; Mon, 06 Oct 2008 13:31:24 +0000 Received: from jaguar.ecp.fr ([138.195.33.9]) by 3b2kzd1.ch3.sourceforge.com with esmtp (Exim 4.69) id 1Kmq8i-0002V9-P5 for user-mode-linux-devel@lists.sourceforge.net; Mon, 06 Oct 2008 13:31:24 +0000 Message-ID: <48EA1285.9050806@ecp.fr> Date: Mon, 06 Oct 2008 15:28:37 +0200 From: Nicolas Boullis MIME-Version: 1.0 References: <48CA7158.5080500@ecp.fr> <48CE23E5.4070308@ecp.fr> <48E4CDE3.9090502@ecp.fr> <20081004042815.GA18807@c2.user-mode-linux.org> <20081004183731.cajymruq1vwocwks@webmail.ecp.fr> In-Reply-To: <20081004183731.cajymruq1vwocwks@webmail.ecp.fr> Subject: Re: [uml-devel] parallel I/O List-Id: The user-mode Linux development list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Errors-To: user-mode-linux-devel-bounces@lists.sourceforge.net To: Jeff Dike , user-mode-linux-devel@lists.sourceforge.net Hi, Nicolas Boullis wrote: > On a reasonably new host, using as UBD devices logical volumes built = > on top of a FC SAN, building a 10GB ext3 filesystem took something = > like 50 seconds before my patch, and something like 3 seconds after = > it. (I can check the exact values if you wish.) Hmmm... my memory was making thing much better than they really are. It's around 38 seconds with 2.6.18 (before the "batch I/O requests" change); it's several minutes with unpatched 2.6.24, and it's around 7 seconds with patched 2.6.24... To be more honnest, my patch contains a part similar to Steve VanDeBogart's "ubd does multiple io's when one will suffice" patch. Using 2.6.24 with his patch but still serialized I/O, the time is around 23 seconds. Hence, my patch (with 16 threads per device) make things around 3 times faster. Cheers, Nicolas Boullis =C9cole Centrale Paris ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great priz= es Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=3D100&url=3D/ _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel