From mboxrd@z Thu Jan 1 00:00:00 1970 From: Petr Vandrovec Subject: Re: Resets on sil3124 & sil3726 PMP Date: Mon, 03 Sep 2007 18:38:17 -0700 Message-ID: <46DCB709.902@vc.cvut.cz> References: <46D2595B.1030409@sauce.co.nz> <46D2792B.401@vc.cvut.cz> <46DBCCE9.9080806@gmail.com> <46DBDA84.3050505@vc.cvut.cz> <46DC030E.9070704@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mailgw.cvut.cz ([147.32.3.235]:34873 "EHLO mailgw.cvut.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752079AbXIDBiT (ORCPT ); Mon, 3 Sep 2007 21:38:19 -0400 In-Reply-To: <46DC030E.9070704@gmail.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Tejun Heo Cc: Richard Scobie , linux-ide@vger.kernel.org Tejun Heo wrote: > Hello, > > Petr Vandrovec wrote: >> I have recompiled kernel with all debugging disabled, and it brought me >> 1.5MBps, so it is still consistently 1MBps slower than on sil. Disabling >> NCQ seems to improve concurrent access a bit (for which I have no >> explanation), while slows down single drive scenario: >> >> With NCQ: >> >> 1TB alone: 81.22, 79.86 >> 1TB+1TB: 56.28+56.70, 53.51+56.11 >> >> Without NCQ: >> >> 1TB alone: 79.78, 80.82 >> 1TB+1TB: 57.99+58.12, 56.50+56.46 3124-2 (norco 4618): NCQ: 1TB alone: 82.30, 82.43 1TB+1TB: 68.36+68.25 noNCQ: 1TB alone: 82.39, 82.29 1TB+1TB: 70.33+70.32, 69.47+70.01 Unfortunately that enclosure has only two slots used. I'll try to not forget bring two more disks tomorrow to get it fully populated. >> 3512 sil, no NCQ: >> >> 1TB alone: 82.28, 82.18 >> 1TB+1TB: 47.20+47.54 # Here apparently command based switching or >> 1.5Gbps link between device and PMP becomes bottleneck > > Hmmmm.... Weird. Is the different still there if you take PMP out of > the picture? Will do tomorrow. I need physical access to the box to do that. Petr