From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robert Hancock Subject: Re: [PATCH] ahci: disable FPDMA auto-activate optimization on NVIDIA AHCI Date: Mon, 15 Feb 2010 12:34:18 -0600 Message-ID: <51f3faa71002151034k225d204fr5ce0af821e39c639@mail.gmail.com> References: <4B5FC213.1060601@gmail.com> <4B772BE2.30108@garzik.org> <51f3faa71002131453m4dd2b82cgd8b874866146da60@mail.gmail.com> <4B772F74.1030509@garzik.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail-iw0-f185.google.com ([209.85.223.185]:39217 "EHLO mail-iw0-f185.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755801Ab0BOSeT convert rfc822-to-8bit (ORCPT ); Mon, 15 Feb 2010 13:34:19 -0500 In-Reply-To: <4B772F74.1030509@garzik.org> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Jeff Garzik Cc: linux-kernel , ide , Mike Cui , Peer Chen , Allen Martin On Sat, Feb 13, 2010 at 5:02 PM, Jeff Garzik wrote: >>>> Mike, can you test this out and make sure this resolves the proble= m for >>>> you? >>> >>> Sigh... =A0 we never did hear back from Mike or NVIDIA on this one,= did we? >>> =A0I've been watching for a response, and haven't seen one to date. >> >> No, I haven't seen a response. It's pretty apparent it should fix th= e >> problem based on earlier testing, but it would be nice to find out f= or >> sure which chipsets this affects. > > Yep, that's my main concern... =A0being overly aggressive and zapping= it on > all NVIDIA chipsets, even future ones. I'm thinking if we don't hear any more specifics on the problem from NVIDIA or someone otherwise knowledgeable Real Soon Now we should likely just merge this patch. MCP79 is a fairly new chipset and it's likely a good assumption that the older NVIDIA AHCI chipsets would have the same issue. It's possible that some of the newer chipsets do or will fix the problem, but we can address that at a later date - the auto-activate optimization is pretty minor and not worth breaking things if there's doubt of it working on these controllers..