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SubjectRe: [PATCH 06/18] virtio_ring: avail event index interface
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On Sun, 15 May 2011 15:47:27 +0300, "Michael S. Tsirkin" <mst@redhat.com> wrote:
> On Mon, May 09, 2011 at 01:43:15PM +0930, Rusty Russell wrote:
> > On Wed, 4 May 2011 23:51:19 +0300, "Michael S. Tsirkin" <mst@redhat.com> wrote:
> > > #define VIRTIO_RING_F_USED_EVENT_IDX 29
> > > +/* The Host publishes the avail index for which it expects a kick
> > > + * at the end of the used ring. Guest should ignore the used->flags field. */
> > > +#define VIRTIO_RING_F_AVAIL_EVENT_IDX 32
> >
> > Are you really sure we want to separate the two? Seems a little simpler
> > to have one bit to mean "we're publishing our threshold". For someone
> > implementing this from scratch, it's a little simpler.
> >
> > Or are there cases where the old style makes more sense?
> >
> > Thanks,
> > Rusty.
>
> Hmm, it makes debugging easier as each side can disable
> publishing separately - I used it all the time when I saw
> e.g. networking stuck to guess whether I need to investigate the
> interrupt or the exit handling.
>
> But I'm not hung up on this.
>
> Let me know pls.

If we combine them into one, then these patches no longer depend on
the feature bit expansion, which is worthwhile (though I'll take both).

Thanks,
Rusty.


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