* cody (mail.kai.huang@xxxxxxxxx) wrote: > On 11/11/2011 05:20 PM, David Woodhouse wrote: > >On Fri, 2011-11-11 at 17:08 -0800, Chris Wright wrote: > >>On a slightly separate, but performance related note...have you ever > >>tried using the hw queue? Currently we only have a sw queue, but the > >>submission path for invalidations doesn't really queue (unless I missed > >>it). It seems to pull from the software queue and submit/wait, > >>submit/wait...Seems simple enough to submit the whole queue and then > >>issue the wait. > >I have a feeling we trigger errata if we do that — although if we're > >only doing it for an emulated IOMMU that shouldn't be an issue. > > > What does the emulated IOMMU here? Does it mean the emulated IOMMU > exposed to guest VM? Yes. So for KVM, the IOMMU emulation would be in QEMU. thanks, -chris -- 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
