From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1031178AbXD1NAT (ORCPT ); Sat, 28 Apr 2007 09:00:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1031160AbXD1NAS (ORCPT ); Sat, 28 Apr 2007 09:00:18 -0400 Received: from gateway-1237.mvista.com ([63.81.120.155]:40488 "EHLO imap.sh.mvista.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1030634AbXD1NAB (ORCPT ); Sat, 28 Apr 2007 09:00:01 -0400 Message-ID: <463345B1.1070600@ru.mvista.com> Date: Sat, 28 Apr 2007 17:01:37 +0400 From: Sergei Shtylyov Organization: MontaVista Software Inc. User-Agent: Mozilla/5.0 (X11; U; Linux i686; rv:1.7.2) Gecko/20040803 X-Accept-Language: ru, en-us, en-gb MIME-Version: 1.0 To: Alan Cox Cc: Mike Mattie , lkml Subject: Re: htpt366 PCI latency value is really high References: <20070426064927.13d0ed72@reforged> <4630B789.3040402@ru.mvista.com> <20070427230950.33d4d040@reforged> <20070428104811.574de77b@the-village.bc.nu> In-Reply-To: <20070428104811.574de77b@the-village.bc.nu> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hello. Alan Cox wrote: >>There are many reasons a card would default to a higher level, but in >>the end it is basically tuning the card for a server application. >>A warning that some cards default to high PCI latency values; settings that >>can interfere with latency sensitive devices such as sounds cards - this >>could be a help to others. > A warning that there are quite a few cards that subtly corrupt your data > if you don't have the latency set to values to work around chip errata is > also worth making. > You fiddle with PCI latency values at your peril, and preferably with the > data sheet and errata docs to hand. And I don't have the latter for the HighPoint chips. Not sure if anybody ever had it. :-) > Alan MBR, Sergei