From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wu Fengguang Subject: Re: [PATCH 01/11] readahead: limit readahead size for small devices Date: Thu, 4 Feb 2010 21:00:56 +0800 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 Cc: Andrew Morton , Jens Axboe , Peter Zijlstra , Linux Memory Management List , "linux-fsdevel@vger.kernel.org" , LKML To: Clemens Ladisch Return-path: Content-Disposition: inline In-Reply-To: <4B6A8455.5010403@ladisch.de> Sender: owner-linux-mm@kvack.org List-Id: linux-fsdevel.vger.kernel.org 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org