linux-kernel - RE: [RESEND,PATCH] DCA, x86: fix invalid memory access in DCA core

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Message-ID: <436EC33EF05C3442BBF5497FC9483FF4162732ED@IRSMSX101.ger.corp.intel.com>
Date:	Fri, 18 May 2012 14:10:04 +0000
From:	"Sosnowski, Maciej" <maciej.sosnowski@...el.com>
To:	Jiang Liu <liuj97@...il.com>
CC:	"Williams, Dan J" <dan.j.williams@...el.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Keping Chen <chenkeping@...wei.com>
Subject: RE: [RESEND,PATCH] DCA, x86: fix invalid memory access in DCA core

On Thu, May 07, May 10, 2012 3:59 AM, Jiang Liu <liuj97@...il.com> 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.

Thanks,
Maciej
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