linux-kernel - Re: [V2 PATCH 9/9] vhost: zerocopy: poll vq in zerocopy callback

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Message-ID: <4FBB66C6.2020701@redhat.com>
Date:	Tue, 22 May 2012 18:13:26 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	Shirley Ma <mashirle@...ibm.com>
CC:	"Michael S. Tsirkin" <mst@...hat.com>, eric.dumazet@...il.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	ebiederm@...ssion.com, davem@...emloft.net
Subject: Re: [V2 PATCH 9/9] vhost: zerocopy: poll vq in zerocopy callback

On 05/22/2012 12:12 AM, Shirley Ma wrote:
> Then it could be too early for vhost to notify guest anywhere in
> handle_tx for zerocopy. Then we might need to remove any notification in
> handle_tx for zerocopy to vhost zerocopy callback instead.
>
> Adding vhost_poll_queue in vhost zerocopy callback unconditionally would
> consume unnecessary cpu.
>
> We need to think about a better solution here.

A possible idea is only call vhost_poll_queue only when the packet of 
used_event were sent: if there's no out-of-order completion vhost could 
signal the guest; if there is, let the pending packets before used_event 
call vhost_poll_queue.
> Thanks
> Shirley

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