From mboxrd@z Thu Jan 1 00:00:00 1970 From: "kyle" Subject: Re: ICH7: ata_piix twice as fast as ahci? Date: Fri, 25 Apr 2008 11:09:28 +0800 Message-ID: <00b001c8a681$c65fac90$9d02a8c0@kyle> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from mail.southa.com ([125.215.237.177]:50055 "HELO southa.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752496AbYDYDJg (ORCPT ); Thu, 24 Apr 2008 23:09:36 -0400 Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: linux-ide@vger.kernel.org Cc: joris@v5.de Hello Joris, Have you solve the problem? If so, how? I think I hit the similiar problem as yours, but instead of ICH7, I hit the problem with ICH9. 8 x Seagate 500GB harddisks are connected to ICH9 and sil24 PCI-E controller, transfer rate of disks connected to ICH9 are limited at around 47MB/s, while disks connected to sil24 reach 104MB/s. All harddisks are NCQ enabled, so I don't think NCQ is the problem. please cc me if possible. Regards, Kyle > Hello List, > Odd problem on my machines: the sata disks appear to be a lot slower > when used via ata_piix vs the ahci driver. > * dd if=/dev/sda of=/dev/null runs at roughly 50MB/s under ahci a > steady 100MB/s under ata_piix, same for hdparm > * bonnie++ -d /home/bonnietest -s 16G -r 8192 -u root returns: