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

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Date:	Wed, 23 May 2012 15:11:48 +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 Fri, May 18, 2012 4:31 PM, Jiang Liu <liuj97@...il.com> wrote:
>
>On 05/18/2012 10:10 PM, Sosnowski, Maciej wrote:
>> 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.
>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
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