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Re: [Qemu-devel] [PATCH v3 6/6] vfio/quirks: Enable ioeventfd quirks to
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From: |
Peter Xu |
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Subject: |
Re: [Qemu-devel] [PATCH v3 6/6] vfio/quirks: Enable ioeventfd quirks to be handled by vfio directly |
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Date: |
Fri, 4 May 2018 10:17:34 +0800 |
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User-agent: |
Mutt/1.9.3 (2018-01-21) |
On Thu, May 03, 2018 at 03:45:13PM -0600, Alex Williamson wrote:
> With vfio ioeventfd support, we can program vfio-pci to perform a
> specified BAR write when an eventfd is triggered. This allows the
> KVM ioeventfd to be wired directly to vfio-pci, entirely avoiding
> userspace handling for these events. On the same micro-benchmark
> where the ioeventfd got us to almost 90% of performance versus
> disabling the GeForce quirks, this gets us to within 95%.
>
> Signed-off-by: Alex Williamson <address@hidden>
Reviewed-by: Peter Xu <address@hidden>
--
Peter Xu
- [Qemu-devel] [PATCH v3 0/6] vfio/quirks: ioeventfd support, Alex Williamson, 2018/05/03
- [Qemu-devel] [PATCH v3 1/6] scripts/update-linux-headers: Update handling of __aligned_u64, Alex Williamson, 2018/05/03
- [Qemu-devel] [PATCH v3 3/6] vfio/quirks: Add common quirk alloc helper, Alex Williamson, 2018/05/03
- [Qemu-devel] [PATCH v3 2/6] linux-headers: Update to v4.17-rc3, Alex Williamson, 2018/05/03
- [Qemu-devel] [PATCH v3 4/6] vfio/quirks: Add quirk reset callback, Alex Williamson, 2018/05/03
- [Qemu-devel] [PATCH v3 5/6] vfio/quirks: ioeventfd quirk acceleration, Alex Williamson, 2018/05/03
- [Qemu-devel] [PATCH v3 6/6] vfio/quirks: Enable ioeventfd quirks to be handled by vfio directly, Alex Williamson, 2018/05/03