linux-kernel - Re: [PATCHv4 2/2] vhost_net: a kernel-level virtio server

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Message-ID: <20090826165655.GA23632@redhat.com>
Date:	Wed, 26 Aug 2009 19:56:55 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, mingo@...e.hu,
	linux-mm@...ck.org, akpm@...ux-foundation.org, hpa@...or.com,
	gregory.haskins@...il.com
Subject: Re: [PATCHv4 2/2] vhost_net: a kernel-level virtio server

On Tue, Aug 25, 2009 at 04:16:34PM +0300, Michael S. Tsirkin wrote:
> > > +	/* If they don't want an interrupt, don't send one, unless empty. */
> > > +	if ((flags & VRING_AVAIL_F_NO_INTERRUPT) && vq->inflight)
> > > +		return;
> > 
> > And I wouldn't support notify on empty at all, TBH.
> 
> If I don't, virtio net in guest uses a timer, which might be expensive.
> Will need to check what this does.
> 
> >  It should
> > definitely be conditional on the guest accepting the NOTIFY_ON_EMPTY
> > feature.

lguest does not do it this way though, do it?
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