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

[Jiang Liu]

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@xxxxxxxxx>  wrote:
> > On 05/18/2012 10:10 PM, Sosnowski, Maciej wrote:
> > > On Thu, May 07, May 10, 2012 3:59 AM, Jiang Liu<liuj97@xxxxxxxxx>  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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