Subject: Re: [PATCHv2] vhost-net: utilize PUBLISH_USED_IDX feature

From: Avi Kivity <[email-masked]>
Date: Tue, 18 May 2010 20:47:19 +0300

On 05/18/2010 05:21 AM, Michael S. Tsirkin wrote:
> 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.
>    

Seems to be missing the cacheline alignment.

Rusty's clarification did not satisfy me, I think it's needed.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.