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Re: [Qemu-devel] Re: [PATCH 2/3] virtio-pci: Use ioeventfd for virtqueue
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] Re: [PATCH 2/3] virtio-pci: Use ioeventfd for virtqueue notify |
Date: |
Mon, 15 Nov 2010 11:20:19 +0000 |
On Sun, Nov 14, 2010 at 12:19 PM, Avi Kivity <address@hidden> wrote:
> On 11/14/2010 01:05 PM, Avi Kivity wrote:
>>>
>>> I agree, but let's enable virtio-ioeventfd carefully because bad code
>>> is out there.
>>
>>
>> Sure. Note as long as the thread waiting on ioeventfd doesn't consume too
>> much cpu, it will awaken quickly and we won't have the "transaction per
>> timeslice" effect.
>>
>> btw, what about virtio-blk with linux-aio? Have you benchmarked that with
>> and without ioeventfd?
>>
>
> And, what about efficiency? As in bits/cycle?
We are running benchmarks with this latest patch and will report results.
Stefan
- [Qemu-devel] Re: [PATCH 2/3] virtio-pci: Use ioeventfd for virtqueue notify, (continued)
[Qemu-devel] Re: [PATCH 2/3] virtio-pci: Use ioeventfd for virtqueue notify, Christoph Hellwig, 2010/11/11
- Re: [Qemu-devel] Re: [PATCH 2/3] virtio-pci: Use ioeventfd for virtqueue notify, Stefan Hajnoczi, 2010/11/12
- Re: [Qemu-devel] Re: [PATCH 2/3] virtio-pci: Use ioeventfd for virtqueue notify, Avi Kivity, 2010/11/14
- Re: [Qemu-devel] Re: [PATCH 2/3] virtio-pci: Use ioeventfd for virtqueue notify, Stefan Hajnoczi, 2010/11/14
- Re: [Qemu-devel] Re: [PATCH 2/3] virtio-pci: Use ioeventfd for virtqueue notify, Avi Kivity, 2010/11/14
- Re: [Qemu-devel] Re: [PATCH 2/3] virtio-pci: Use ioeventfd for virtqueue notify, Avi Kivity, 2010/11/14
- Re: [Qemu-devel] Re: [PATCH 2/3] virtio-pci: Use ioeventfd for virtqueue notify,
Stefan Hajnoczi <=
[Qemu-devel] Re: [PATCH 2/3] virtio-pci: Use ioeventfd for virtqueue notify, Avi Kivity, 2010/11/11
[Qemu-devel] [PATCH 3/3] virtio-pci: Don't use ioeventfd on old kernels, Stefan Hajnoczi, 2010/11/11
[Qemu-devel] Re: [PATCH v2 0/3] virtio: Use ioeventfd for virtqueue notify, Michael S. Tsirkin, 2010/11/11