From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Moyer Subject: Re: New driver mtipx2xx submission Date: Wed, 25 May 2011 10:36:31 -0400 Message-ID: References: <22A973199D2C2F46933448F6E7990A300204F2BC@ntxboimbx31.micron.com> <20110428230605.78c55c70@lxorguk.ukuu.org.uk> <22A973199D2C2F46933448F6E7990A300204F728@ntxboimbx31.micron.com> <20110502184206.25907c5e@lxorguk.ukuu.org.uk> <22A973199D2C2F46933448F6E7990A300214B0D6@ntxboimbx31.micron.com> <20110511202013.075b07cc@lxorguk.ukuu.org.uk> <4DD722DB.8030303@micron.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mx1.redhat.com ([209.132.183.28]:7120 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753160Ab1EYOgp (ORCPT ); Wed, 25 May 2011 10:36:45 -0400 In-Reply-To: <4DD722DB.8030303@micron.com> (Asai Thambi S. P.'s message of "Fri, 20 May 2011 20:26:35 -0600") Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: asamymuthupa@micron.com Cc: Alan Cox , linux-ide@vger.kernel.org Asai Thambi S P writes: > On 5/11/2011 1:20 PM, Alan Cox wrote: >> So a bigger queue helped (at least in 2006). The AHCI driver can be >> taught your bigger queue easily enough. The question is where with a >> *current* kernel are any remaining bottlenecks if you do that and how do >> we fix them. > > Attached image/table shows the performance numbers on current kernel. > > The main objectives of our new mtipx2xx driver are > 1.) highest performance (see attached image/table), > 2.) lowest CPU utilization, and Can you collect perf data to show why the ahci driver is taking up so much more CPU for the random I/O case? Thanks, Jeff