Re: [Qemu-devel] [PATCH v3 4/4] dataplane: submit I/O at batch

[Eric Blake]

On 07/01/2014 10:35 AM, Ming Lei wrote:
> Before commit 580b6b2aa2(dataplane: use the Qemu block
> layer for I/O), dataplane for virtio-blk submits block
> I/O at batch.

s/at/as a/

> 
> This commit 580b6b2aa2 replaces the custom linux AIO
> implementation(including I/O batch) with Qemu block

s/(/ (/

> layer, but this commit causes ~40% throughput regression
> on virtio-blk performance, and removing submitting I/O
> at batch is one of the cause.

s/at/as a/

> 
> This patch applys the new introduced bdrv_io_plug() and

s/applys/applies/

s/new/newly/

> bdrv_io_unplug() interfaces to support submitting I/O
> at batch for Qemu block layer, and in my test, the change

s/at/as a/

> can improve thoughput by ~30% with 'aio=native'.

s/thoughput/throughput/


-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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