From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rik van Riel Subject: Re: [PATCH 01/15] readahead: limit readahead size for small devices Date: Wed, 24 Feb 2010 22:11:02 -0500 Message-ID: <4B85EA46.5090607@redhat.com> References: <20100224031001.026464755@intel.com> <20100224031053.737437080@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: Andrew Morton , Jens Axboe , Li Shaohua , Clemens Ladisch , Chris Mason , Peter Zijlstra , Olivier Galibert , Vivek Goyal , Christian Ehrhardt , Matt Mackall , Nick Piggin , Linux Memory Management List , linux-fsdevel@vger.kernel.org, LKML To: Wu Fengguang Return-path: In-Reply-To: <20100224031053.737437080@intel.com> Sender: owner-linux-mm@kvack.org List-Id: linux-fsdevel.vger.kernel.org On 02/23/2010 10:10 PM, Wu Fengguang wrote: > Linus reports a _really_ small& slow (505kB, 15kB/s) USB device, > on which blkid runs unpleasantly slow. He manages to optimize the blkid > reads down to 1kB+16kB, but still kernel read-ahead turns it into 48kB. > CC: Li Shaohua > CC: Clemens Ladisch > Acked-by: Jens Axboe > Tested-by: Vivek Goyal > Tested-by: Linus Torvalds > Signed-off-by: Wu Fengguang Acked-by: Rik van Riel -- 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