Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754404AbXJJG0s (ORCPT ); Wed, 10 Oct 2007 02:26:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751854AbXJJG0k (ORCPT ); Wed, 10 Oct 2007 02:26:40 -0400 Received: from smile.2scale.net ([212.12.33.142]:50952 "EHLO smile.2scale.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751694AbXJJG0j (ORCPT ); Wed, 10 Oct 2007 02:26:39 -0400 Subject: Re: howto boost write(2) performance? From: Michael Stiller To: Nick Piggin Cc: linux-kernel@vger.kernel.org In-Reply-To: <200710092025.34436.nickpiggin@yahoo.com.au> References: <1191937817.3641.9.camel@blackberry> <200710092025.34436.nickpiggin@yahoo.com.au> Content-Type: text/plain Organization: 2scale GmbH Date: Wed, 10 Oct 2007 08:26:27 +0200 Message-Id: <1191997587.3675.4.camel@blackberry> Mime-Version: 1.0 X-Mailer: Evolution 2.8.3 (2.8.3-2.fc6) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 686 Lines: 26 > > The kernel really cannot sustain 125MB/s? I assume the disk > array is capable? Yes, the array should be capable, LSI controller U320, SATA disks inside the array. > Where is the bottleneck? Does it keep all disks busy, or are > the CPUs overloaded? I'm not sure where the bottleneck is. CPU Load goes up with many pdflush processes in D state. Thanks for the suggestions with sg and O_DIRECT so far, will try this. -Michael - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/