From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Andrewartha Subject: Re: Mysteriously slow writes SiI 3124 Date: Wed, 01 Apr 2009 13:34:00 +0800 Message-ID: <49D2FCC8.1060204@daa.com.au> References: <49AB079A.9090407@rabbit.us> <49AE294D.2020002@rabbit.us> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: Received: from quoll.daa.com.au ([203.17.251.1]:40214 "EHLO quoll.daa.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750902AbZDAFmL (ORCPT ); Wed, 1 Apr 2009 01:42:11 -0400 In-Reply-To: Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Grant Grundler Cc: Peter Rabbitson , linux-ide@vger.kernel.org Grant Grundler wrote: > On Tue, Mar 3, 2009 at 11:10 PM, Peter Rabbitson wrote: >> No takers? Can I provide more info/measurements/whatever? I would >> really like to get to the bottom of this, pretty frustrating. > > Are you ok with wild guesses? > This sounds remarkable similar to the performance of the equivalent > PCIe SATA controller from Silicon Image (3132). The 3132 has 1 PCI-E > lane and should able to move more than 220 MB/s or so. But in fact can > only read 120MB/s and write 170MB/s. The hardware is limited: http://ata.wiki.kernel.org/index.php/Hardware,_driver_status#Silicon_Image_3124 http://www.mail-archive.com/linux-ide@vger.kernel.org/msg10143.html http://markmail.org/message/dkwn2imwkjg7aeyl -- James Andrewartha