From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965696Ab0B0LJK (ORCPT ); Sat, 27 Feb 2010 06:09:10 -0500 Received: from lucidpixels.com ([75.144.35.66]:34583 "EHLO lucidpixels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965569Ab0B0LJI (ORCPT ); Sat, 27 Feb 2010 06:09:08 -0500 Date: Sat, 27 Feb 2010 06:09:07 -0500 (EST) From: Justin Piszcz To: Eric Sandeen cc: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, Alan Piszcz Subject: Re: EXT4 is ~2X as slow as XFS (593MB/s vs 304MB/s) for writes? In-Reply-To: Message-ID: References: <4B886CA1.9050906@redhat.com> <4B887160.2090606@redhat.com> <4B887548.50508@redhat.com> User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 27 Feb 2010, Justin Piszcz wrote: > > > On Sat, 27 Feb 2010, Justin Piszcz wrote: > > > > > > > On Fri, 26 Feb 2010, Eric Sandeen wrote: > > Hi, I have found the same results on 2 different systems: It seems to peak at ~350MiB/s performance on mdadm raid, whether a RAID-5 or RAID-0 (two separate machines): The only option I found that allows it to go from: 10737418240 bytes (11 GB) copied, 48.7335 s, 220 MB/s to 10737418240 bytes (11 GB) copied, 30.5425 s, 352 MB/s Is the -o nodelalloc option. How come it is not breaking the 350MiB/s barrier is the question? Justin.