From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pb0-f46.google.com ([209.85.160.46]:39655 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751892Ab2EROau (ORCPT ); Fri, 18 May 2012 10:30:50 -0400 Message-ID: <4FB65D0E.9060004@gmail.com> Date: Fri, 18 May 2012 22:30:38 +0800 From: Jiang Liu MIME-Version: 1.0 To: "Sosnowski, Maciej" CC: "Williams, Dan J" , Jiang Liu , "linux-pci@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Keping Chen Subject: Re: [RESEND,PATCH] DCA, x86: fix invalid memory access in DCA core References: <1336406288-9479-1-git-send-email-jiang.liu@huawei.com> <436EC33EF05C3442BBF5497FC9483FF41626EACA@IRSMSX101.ger.corp.intel.com> <4FAB20FB.6070508@gmail.com> <436EC33EF05C3442BBF5497FC9483FF4162732ED@IRSMSX101.ger.corp.intel.com> In-Reply-To: <436EC33EF05C3442BBF5497FC9483FF4162732ED@IRSMSX101.ger.corp.intel.com> Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-pci-owner@vger.kernel.org List-ID: On 05/18/2012 10:10 PM, Sosnowski, Maciej wrote: > On Thu, May 07, May 10, 2012 3:59 AM, Jiang Liu wrote: >> >> Hi Maciej, >> I feel we may also need to tune the multiple IOH support in DCA. >> Multiple IOH support is disabled for CB3.0 devices, how about CB3.1 devices >> in Ivrbridge or SandyBridge? Does the hardware limitation still exist? Or >> could we support multiple IOHs with IvyBridge and SandyBridge? >> If multiple IOH is supported, I think we should move the logic to >> disable multiple IOH support for CB3.0 from DCA core into ioatdma. I have >> also prepared two patches for that two. >> Thanks! >> > > At this point I do not think we would need to tune multiple IOH for DCA. > The limitation you mention applies only to CB3.0. I do not think DCA is supported > with Sandy Bridge / Ivy Bridge regardless of multi-IOH case but let me confirm it > yet. It seems that Intel introduces DDIO technology for IvyBridge. Does it replace DCA technology on new platforms? Thanks! > > Thanks, > Maciej