Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933667Ab2EWPML (ORCPT ); Wed, 23 May 2012 11:12:11 -0400 Received: from mga02.intel.com ([134.134.136.20]:10708 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932692Ab2EWPMI convert rfc822-to-8bit (ORCPT ); Wed, 23 May 2012 11:12:08 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.67,352,1309762800"; d="scan'208";a="143775585" From: "Sosnowski, Maciej" To: Jiang Liu 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 Thread-Topic: [RESEND,PATCH] DCA, x86: fix invalid memory access in DCA core Thread-Index: AQHNLGpswXPcpzMJXUaOCs7yj0xbMZbBjugAgACoiYCADSUdUIAAP3AAgAf3T3A= Date: Wed, 23 May 2012 15:11:48 +0000 Message-ID: <436EC33EF05C3442BBF5497FC9483FF416274D2A@IRSMSX101.ger.corp.intel.com> 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> In-Reply-To: <4FB65D0E.9060004@gmail.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [163.33.239.180] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1495 Lines: 38 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/