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 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
