From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: Resets on sil3124 & sil3726 PMP Date: Fri, 07 Sep 2007 03:02:45 +0900 Message-ID: <46E040C5.1060509@gmail.com> References: <46D2595B.1030409@sauce.co.nz> <46D2792B.401@vc.cvut.cz> <46DBCCE9.9080806@gmail.com> <46DBDA84.3050505@vc.cvut.cz> <46DC030E.9070704@gmail.com> <46DCB709.902@vc.cvut.cz> <46DE9C20.9030007@vc.cvut.cz> <20070905213006.GH22695@curie-int.orbis-terrarum.net> <46DFCDF0.6050107@vc.cvut.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from rv-out-0910.google.com ([209.85.198.184]:9044 "EHLO rv-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755672AbXIFSES (ORCPT ); Thu, 6 Sep 2007 14:04:18 -0400 Received: by rv-out-0910.google.com with SMTP id k20so205926rvb for ; Thu, 06 Sep 2007 11:04:17 -0700 (PDT) In-Reply-To: <46DFCDF0.6050107@vc.cvut.cz> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Petr Vandrovec Cc: "Robin H. Johnson" , linux-ide@vger.kernel.org, Richard Scobie Petr Vandrovec wrote: > Concurrent hdparm -t, like > > hdparm -t /dev/sdd & hdparm -t /dev/sde & hdparm -t /dev/sdf & hdparm -t > /dev/sdg & sleep 20 > > (and from hdparm output & visually confirmed that all activity LEDs go > on & off simultaneously) Not sure whether it matters but 'hdparm' tests are fairly short. You can probably get more reliable result using dd with direct flag specified. > So NCQ should not be able to show any (definitely not huge) benefits, > but there should not be any reason to not get 4x 1 drive speed as long > as neither PMP link nor PCI-X limits are hit. As said before, 3124/32 hardware seems to have limitations in transfer rate it can reach. Thanks. -- tejun