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Date: Mon, 14 Nov 2011 20:54:04 -0800 From: Chris Wright <chrisw@...s-sol.org> To: cody <mail.kai.huang@...il.com> Cc: David Woodhouse <dwmw2@...radead.org>, Roland Dreier <roland@...estorage.com>, linux-pci@...r.kernel.org, iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, Chris Wright <chrisw@...s-sol.org> Subject: Re: [PATCH] intel-iommu: Default to non-coherent for domains unattached to iommus * cody (mail.kai.huang@...il.com) 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-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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