From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Lord Subject: Re: SSD slowdown with 3.3.X? Date: Fri, 20 Apr 2012 22:40:24 -0400 Message-ID: <4F921E18.6000301@teksavvy.com> References: <4F8F7533.6020300@gmail.com> <4F8F82EC.1060708@teksavvy.com> <4F90C4CF.1010000@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: Received: from ironport-out.teksavvy.com ([206.248.143.162]:2214 "EHLO ironport-out.teksavvy.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753588Ab2DUCk0 (ORCPT ); Fri, 20 Apr 2012 22:40:26 -0400 In-Reply-To: <4F90C4CF.1010000@gmail.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Joe Ceklosky , "linux-ide@vger.kernel.org >> IDE/ATA development list" On 12-04-19 10:07 PM, Joe Ceklosky wrote: > Mark, > > > Thanks for the info, but nothing like that shows up: > > > [jceklosk@neptune tmp]$ cat c-3.2.15 > noop deadline [cfq] > noop deadline [cfq] > > > [jceklosk@neptune tmp]$ cat c-3.3.2 > noop deadline [cfq] > noop deadline [cfq] Well, the stuff you posted (above) shows that cfq is being used instead of noop. For SSDs, noop is the more natural choice, and used to be the default in the kernel for a while. I wonder when that changed? You can change it (after boot) by just echo'ing "noop" into those same sysfs entries. Cheers