netdev - Re: [PATCH] virtio: put last seen used index into ring itself

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Message-Id: <201005181711.08128.rusty@rustcorp.com.au>
Date:	Tue, 18 May 2010 17:11:07 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Jiri Pirko <jpirko@...hat.com>, Shirley Ma <xma@...ibm.com>,
	Amit Shah <amit.shah@...hat.com>,
	Mark McLoughlin <markmc@...hat.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, quintela@...hat.com,
	alex.williamson@...hat.com
Subject: Re: [PATCH] virtio: put last seen used index into ring itself

On Tue, 18 May 2010 10:17:44 am Michael S. Tsirkin wrote:
> Generally, the Host end of the virtio ring doesn't need to see where
> Guest is up to in consuming the ring.  However, to completely understand
> what's going on from the outside, this information must be exposed.
> For example, host can reduce the number of interrupts by detecting
> that the guest is currently handling previous buffers.

Thanks applied.

Cheers,
Rusty.
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