From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f181.google.com (mail-pd0-f181.google.com [209.85.192.181]) by kanga.kvack.org (Postfix) with ESMTP id 53A8A6B0031 for ; Tue, 1 Jul 2014 18:38:23 -0400 (EDT) Received: by mail-pd0-f181.google.com with SMTP id v10so10812311pde.12 for ; Tue, 01 Jul 2014 15:38:23 -0700 (PDT) Received: from ipmail06.adl2.internode.on.net (ipmail06.adl2.internode.on.net. [150.101.137.129]) by mx.google.com with ESMTP id fv4si28292487pbb.224.2014.07.01.15.38.20 for ; Tue, 01 Jul 2014 15:38:21 -0700 (PDT) Date: Wed, 2 Jul 2014 08:38:17 +1000 From: Dave Chinner Subject: Re: [PATCH 0/5] Improve sequential read throughput v4r8 Message-ID: <20140701223817.GI4453@dastard> References: <1404146883-21414-1-git-send-email-mgorman@suse.de> <20140701171611.GB1369@cmpxchg.org> <20140701183915.GW10819@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140701183915.GW10819@suse.de> Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman Cc: Johannes Weiner , Andrew Morton , Linux Kernel , Linux-MM , Linux-FSDevel On Tue, Jul 01, 2014 at 07:39:15PM +0100, Mel Gorman wrote: > On Tue, Jul 01, 2014 at 01:16:11PM -0400, Johannes Weiner wrote: > > On Mon, Jun 30, 2014 at 05:47:59PM +0100, Mel Gorman wrote: > > Seqread throughput is up, randread takes a small hit. But allocation > > latency is badly screwed at higher concurrency levels: > > So the results are roughly similar. You don't state which filesystem it is > but FWIW if it's the ext3 filesystem using the ext4 driver then throughput > at higher levels is also affected by filesystem fragmentation. The problem > was outside the scope of the series. I'd suggest you're both going wrong that the "using ext3" point. Use ext4 or XFS for your performance measurements because that's what everyone is using for the systems these days. iNot to mention they don'thave all the crappy allocation artifacts that ext3 has, nor the throughput limitations caused by the ext3 journal, and so on. Fundamentally, ext3 performance is simply not a relevant performance metric anymore - it's a legacy filesystem in maintenance mode and has been for a few years now... Cheers, Dave. -- Dave Chinner david@fromorbit.com -- 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