From mboxrd@z Thu Jan 1 00:00:00 1970 From: Martin Steigerwald Subject: Re: 12x performance drop on md/linux+sw raid1 due to barriers [xfs] Date: Sun, 14 Dec 2008 19:35:36 +0100 Message-ID: <200812141935.36744.Martin@lichtvoll.de> References: <1229225480.16555.152.camel@localhost> <18757.4606.966139.10342@tree.ty.sabi.co.uk> (sfid-20081214_183524_928808_CA8411E0) Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <18757.4606.966139.10342@tree.ty.sabi.co.uk> Content-Disposition: inline Sender: linux-raid-owner@vger.kernel.org To: linux-xfs@oss.sgi.com Cc: Linux RAID List-Id: linux-raid.ids Am Sonntag 14 Dezember 2008 schrieb Peter Grandi: > First of all, why are you people sending TWO copies to the XFS > mailing list? (to both linux-xfs@oss.sgi.com and xfs@oss.sgi.com). [...] > > So its really more of an expectation that wc+barriers on, > > performs better than wc+barriers off :) > > This is of course a misstatement: perhaps you intended to write > that ''wc on+barriers on'' would perform better than ''wc off + > barriers off'. I think Redeeman said exactly that ;-). Either both on or both off. -- Martin 'Helios' Steigerwald - http://www.Lichtvoll.de GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7