From mboxrd@z Thu Jan 1 00:00:00 1970 From: Phillip Susi Subject: Re: Why is NCQ enabled by default by libata? (2.6.20) Date: Wed, 28 Mar 2007 10:42:47 -0400 Message-ID: <460A7EE7.5070101@cfl.rr.com> References: <20070327161616.31448.qmail@science.horizon.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Justin Piszcz Cc: linux@horizon.com, htejun@gmail.com, jeff@garzik.org, linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-ide@vger.kernel.org Justin Piszcz wrote: > I would try with write-caching enabled. > Also, the RAID5/RAID10 you mention seems like each volume is on part of > the platter, a strange setup you got there :) Shouldn't NCQ only help write performance if write caching is _disabled_? Since write cache essentially is just non tagged command queuing?