netdev - Re: [PATCH 2/2] virtio_net: remove send completion interrupts and avoid TX queue overrun through packet drop

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Message-ID: <87k4fnls45.fsf@rustcorp.com.au>
Date:	Fri, 25 Mar 2011 15:21:54 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Shirley Ma <mashirle@...ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Herbert Xu <herbert@...dor.hengli.com.au>, davem@...emloft.net,
	kvm@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] virtio_net: remove send completion interrupts and avoid TX queue overrun through packet drop

On Thu, 24 Mar 2011 10:46:49 -0700, Shirley Ma <mashirle@...ibm.com> wrote:
> On Thu, 2011-03-24 at 16:28 +0200, Michael S. Tsirkin wrote:
> > Several other things I am looking at, wellcome cooperation:
> > 1. It's probably a good idea to update avail index
> >    immediately instead of upon kick: for RX
> >    this might help parallelism with the host.
> Is that possible to use the same idea for publishing last used idx to
> publish avail idx? Then we can save guest iowrite/exits.

Yes, it should be symmetrical.  Test independently of course, but the
same logic applies.

Thanks!
Rusty.
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