From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jens Axboe Subject: Re: [patch 0/4] ide: Break ide_lock to per-hwgroup lock Date: Tue, 27 Sep 2005 17:58:14 +0200 Message-ID: <20050927155813.GG2811@suse.de> References: <20050906233322.GA3642@localhost.localdomain> <20050907091923.GE4785@suse.de> <20050907192747.GC3769@localhost.localdomain> <20050907193422.GS4785@suse.de> <58cb370e050927063674bb47a7@mail.gmail.com> <20050927152026.GC3822@localhost.localdomain> <20050927152641.GF2811@suse.de> <20050927154201.GD3822@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from ns.virtualhost.dk ([195.184.98.160]:30784 "EHLO virtualhost.dk") by vger.kernel.org with ESMTP id S964988AbVI0P5s (ORCPT ); Tue, 27 Sep 2005 11:57:48 -0400 Content-Disposition: inline In-Reply-To: <20050927154201.GD3822@localhost.localdomain> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Ravikiran G Thirumalai Cc: Bartlomiej Zolnierkiewicz , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org, "Shai Fultheim (Shai@scalex86.org)" , Alok Kataria On Tue, Sep 27 2005, Ravikiran G Thirumalai wrote: > On Tue, Sep 27, 2005 at 05:26:42PM +0200, Jens Axboe wrote: > > On Tue, Sep 27 2005, Ravikiran G Thirumalai wrote: > > > > You should run it eg 10 times on each kernel to get a feel for the > > variance of the results. Were you testing 2 or 4 disks? > > > > Yes, I was planning to do that, We were testing with 2 disks. With 2 disks, the 5.5% sounds like an aweful lot. What block size were the tests run with? To get the file system out of the way, you could run something as simple as a dd on each device. That should show queueing contention (which I guess is the prime area of contention) more isolated. And profiles would still be very interesting to see :-) -- Jens Axboe