Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758162Ab0BDNBL (ORCPT ); Thu, 4 Feb 2010 08:01:11 -0500 Received: from mga14.intel.com ([143.182.124.37]:28879 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757910Ab0BDNBK (ORCPT ); Thu, 4 Feb 2010 08:01:10 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.49,404,1262592000"; d="scan'208";a="240396760" Date: Thu, 4 Feb 2010 21:00:56 +0800 From: Wu Fengguang To: Clemens Ladisch Cc: Andrew Morton , Jens Axboe , Peter Zijlstra , Linux Memory Management List , "linux-fsdevel@vger.kernel.org" , LKML Subject: Re: [PATCH 01/11] readahead: limit readahead size for small devices Message-ID: <20100204130056.GB25905@localhost> References: <20100202152835.683907822@intel.com> <20100202153316.375570078@intel.com> <4B6A8455.5010403@ladisch.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4B6A8455.5010403@ladisch.de> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 856 Lines: 30 Clemens, Thanks for the data! On Thu, Feb 04, 2010 at 04:24:53PM +0800, Clemens Ladisch wrote: > Wu Fengguang wrote: > > Anyone has 512/128MB USB stick? > > 64 MB, USB full speed: > Bus 003 Device 003: ID 08ec:0011 M-Systems Flash Disk Pioneers DiskOnKey > > 4KB: 139.339 s, 376 kB/s > 16KB: 81.0427 s, 647 kB/s > 32KB: 71.8513 s, 730 kB/s > 64KB: 67.3872 s, 778 kB/s > 128KB: 67.5434 s, 776 kB/s > 256KB: 65.9019 s, 796 kB/s > 512KB: 66.2282 s, 792 kB/s > 1024KB: 67.4632 s, 777 kB/s > 2048KB: 69.9759 s, 749 kB/s It seems to reach good throughput at 64KB readahead size :) Thanks, Fengguang -- 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/