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

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Message-id: <4FBD8DE0.7070800@huawei.com>
Date:	Thu, 24 May 2012 09:24:48 +0800
From:	Jiang Liu <jiang.liu@...wei.com>
To:	"Sosnowski, Maciej" <maciej.sosnowski@...el.com>
Cc:	"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

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<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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