Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756592Ab2EXBZO (ORCPT ); Wed, 23 May 2012 21:25:14 -0400 Received: from szxga04-in.huawei.com ([58.251.152.67]:45000 "EHLO szxga04-in.huawei.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1755056Ab2EXBZN (ORCPT ); Wed, 23 May 2012 21:25:13 -0400 Date: Thu, 24 May 2012 09:24:48 +0800 From: Jiang Liu Subject: Re: [RESEND,PATCH] DCA, x86: fix invalid memory access in DCA core In-reply-to: <436EC33EF05C3442BBF5497FC9483FF416274D2A@IRSMSX101.ger.corp.intel.com> X-Originating-IP: [10.107.208.49] To: "Sosnowski, Maciej" Cc: "linux-kernel@vger.kernel.org" , Keping Chen Message-id: <4FBD8DE0.7070800@huawei.com> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7BIT User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:9.0) Gecko/20111222 Thunderbird/9.0.1 X-CFilter-Loop: Reflected 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> <4FB65D0E.9060004@gmail.com> <436EC33EF05C3442BBF5497FC9483FF416274D2A@IRSMSX101.ger.corp.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1788 Lines: 48 Hi Maciej, Thanks for your help. Could you also help to review the IOAT hotplug patch at http://www.spinics.net/lists/linux-pci/msg15287.html? It's to support Intel IOAT device hotplug. Thanks! On 2012-5-23 23:11, Sosnowski, Maciej wrote: > On Fri, May 18, 2012 4:31 PM, Jiang Liu wrote: >> >> 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! > > Yes, in general DDIO is used instead of DCA on new platforms. > Note however that DDIO is supported in Xeon E5 only, not in Xeon E3. > > Thanks, > Maciej > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/