Re: [PATCH] vhost-net: utilize PUBLISH_USED_IDX feature

From: David Miller
Date: Tue May 18 2010 - 00:08:34 EST

From: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Date: Tue, 18 May 2010 04:19:31 +0300

> With PUBLISH_USED_IDX, guest tells us which used entries
> it has consumed. This can be used to reduce the number
> of interrupts: after we write a used entry, if the guest has not yet
> consumed the previous entry, or if the guest has already consumed the
> new entry, we do not need to interrupt.
> This imporves bandwidth by 30% under some workflows.
> Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
> ---
> Rusty, Dave, this patch depends on the patch
> "virtio: put last seen used index into ring itself"
> which is currently destined at Rusty's tree.
> Rusty, if you are taking that one for 2.6.35, please
> take this one as well.
> Dave, any objections?


Acked-by: David S. Miller <davem@xxxxxxxxxxxxx>
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