linux-kernel - Re: [PATCH] virtio_net: free transmit skbs in a timer

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Message-Id: <200805190016.10823.rusty@rustcorp.com.au>
Date:	Mon, 19 May 2008 00:16:10 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Avi Kivity <avi@...ranet.com>
Cc:	Mark McLoughlin <markmc@...hat.com>,
	Anthony Liguori <aliguori@...ibm.com>,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH] virtio_net: free transmit skbs in a timer

On Sunday 18 May 2008 16:40:05 Avi Kivity wrote:
> Rusty Russell wrote:
> > On Friday 16 May 2008 01:32:47 Avi Kivity wrote:
> >> Mark McLoughlin wrote:
> >>> I think Rusty is speaking from the POV of the guest driver - i.e. that
> >>> virtio_net should never disable notifications on the xmit queue using
> >>> disable_cb()?
> >>>
> >>> Sounds like you think agree, but that the host side should throttle the
> >>> rate of xmit notifications?
> >>
> >> Yes.
> >
> > But performance is going to suck in the meantime, as currently our host
> > doesn't do this.
>
> That's what the feature bits are for.

OK.  And since the current situation is that the host doesn't throttle, the 
feature bit should be "don't throttle, host is doing it for you", and Mark's 
patch should go in...

Cheers,
Rusty.
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