Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757793AbZDFV1Y (ORCPT ); Mon, 6 Apr 2009 17:27:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753223AbZDFV1N (ORCPT ); Mon, 6 Apr 2009 17:27:13 -0400 Received: from rtr.ca ([76.10.145.34]:55680 "EHLO mail.rtr.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754538AbZDFV1M (ORCPT ); Mon, 6 Apr 2009 17:27:12 -0400 Message-ID: <49DA73AE.5020106@rtr.ca> Date: Mon, 06 Apr 2009 17:27:10 -0400 From: Mark Lord Organization: Real-Time Remedies Inc. User-Agent: Thunderbird 2.0.0.21 (X11/20090318) MIME-Version: 1.0 To: Lennart Sorensen Cc: Jeff Moyer , Ingo Molnar , Andrew Morton , torvalds@linux-foundation.org, tytso@mit.edu, drees76@gmail.com, jesper@krogh.cc, linux-kernel@vger.kernel.org, jens.axboe@oracle.com Subject: Re: Linux 2.6.29 References: <20090326171148.9bf8f1ec.akpm@linux-foundation.org> <20090326174704.cd36bf7b.akpm@linux-foundation.org> <20090326182519.d576d703.akpm@linux-foundation.org> <20090401210337.GB3797@csclub.uwaterloo.ca> <20090401143622.b1885643.akpm@linux-foundation.org> <20090402010044.GA16092@elte.hu> <20090403040649.GF3795@csclub.uwaterloo.ca> <20090406141516.GM3795@csclub.uwaterloo.ca> In-Reply-To: <20090406141516.GM3795@csclub.uwaterloo.ca> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1025 Lines: 24 Lennart Sorensen wrote: > On Fri, Apr 03, 2009 at 06:28:36PM -0400, Jeff Moyer wrote: >> Could you try one more test, please? Switch back to CFQ and set >> /sys/block/sdX/queue/iosched/slice_idle to 0? > > I actually am running cfq at the moment, but with Mark's (I think it > was) preload library to change fsync calls to at most one per 5 seconds > instead of 10 per second. So far that has certainly made things a lot > better as far as I can tell. Maybe not as good as anticipatory seemed > to be but certainly better. > > I can try your suggestion too. .. Yeah, I think the sync_file_range() patch is the way to go. It seems to be smooth enough here with four or five simultaneous recordings, a couple of commflaggers, and an HD playback all happening at once. Cheers -- 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/