From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: Resets on sil3124 & sil3726 PMP Date: Mon, 03 Sep 2007 21:50:22 +0900 Message-ID: <46DC030E.9070704@gmail.com> References: <46D2595B.1030409@sauce.co.nz> <46D2792B.401@vc.cvut.cz> <46DBCCE9.9080806@gmail.com> <46DBDA84.3050505@vc.cvut.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from rv-out-0910.google.com ([209.85.198.186]:45790 "EHLO rv-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752088AbXICMua (ORCPT ); Mon, 3 Sep 2007 08:50:30 -0400 Received: by rv-out-0910.google.com with SMTP id k20so946611rvb for ; Mon, 03 Sep 2007 05:50:29 -0700 (PDT) In-Reply-To: <46DBDA84.3050505@vc.cvut.cz> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Petr Vandrovec Cc: Richard Scobie , linux-ide@vger.kernel.org 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 > > 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? > And it seems that I observe what other poster pointed out - that > apparently all SiI chips are limited somewhere around 120-130MBps, and > cannot do more even if you pretty ask... Yeah, that seems to be the hardware limit and is consistent with what I hear from non-linux people too. -- tejun