On Sat, Sep 24, 2016 at 06:50:07PM -0700, Stephen Hemminger wrote:
> On Sun, 25 Sep 2016 04:02:28 +0300
> "Michael S. Tsirkin" wrote:
>
> > I see. It's implied by VERSION_1 in fact.
> > In other words if VERSION_1 is negotiated then bit 27
> > isn't ANY_LAYOUT, it's in fact reserved.
>
>
> But
On Fri, Sep 23, 2016 at 01:28:05PM -0700, Stephen Hemminger wrote:
> On Fri, 23 Sep 2016 21:31:27 +0300
> "Michael S. Tsirkin" wrote:
>
> > On Fri, Sep 23, 2016 at 11:24:16AM -0700, Stephen Hemminger wrote:
> > > On Fri, 23 Sep 2016 09:16:49 +0200
> > > Maxime Coquelin wrote:
> > >
> > > > In
On Sun, 25 Sep 2016 04:02:28 +0300
"Michael S. Tsirkin" wrote:
> I see. It's implied by VERSION_1 in fact.
> In other words if VERSION_1 is negotiated then bit 27
> isn't ANY_LAYOUT, it's in fact reserved.
But what if guest isn't using Version 1? Legacy distro's certainly
won't have it enabled.
On Fri, Sep 23, 2016 at 11:24:16AM -0700, Stephen Hemminger wrote:
> On Fri, 23 Sep 2016 09:16:49 +0200
> Maxime Coquelin wrote:
>
> > Indirect descriptors are usually supported by virtio-net devices,
> > allowing to dispatch a larger number of requests.
> >
> > When the virtio device sends a pa
On Fri, Sep 23, 2016 at 09:16:49AM +0200, Maxime Coquelin wrote:
> + if (vq->desc[desc_indexes[i]].flags & VRING_DESC_F_INDIRECT) {
> + if (unlikely(!(dev->features &
> + (1ULL <<
> VIRTIO_RING_F_INDIRECT_DESC {
> +
On Fri, 23 Sep 2016 21:31:27 +0300
"Michael S. Tsirkin" wrote:
> On Fri, Sep 23, 2016 at 11:24:16AM -0700, Stephen Hemminger wrote:
> > On Fri, 23 Sep 2016 09:16:49 +0200
> > Maxime Coquelin wrote:
> >
> > > Indirect descriptors are usually supported by virtio-net devices,
> > > allowing to d
On Fri, 23 Sep 2016 09:16:49 +0200
Maxime Coquelin wrote:
> Indirect descriptors are usually supported by virtio-net devices,
> allowing to dispatch a larger number of requests.
>
> When the virtio device sends a packet using indirect descriptors,
> only one slot is used in the ring, even for la
On 09/23/2016 09:29 AM, Yuanhan Liu wrote:
> On Fri, Sep 23, 2016 at 09:16:49AM +0200, Maxime Coquelin wrote:
>> +if (vq->desc[desc_indexes[i]].flags & VRING_DESC_F_INDIRECT) {
>> +if (unlikely(!(dev->features &
>> +(1ULL <<
>>
Indirect descriptors are usually supported by virtio-net devices,
allowing to dispatch a larger number of requests.
When the virtio device sends a packet using indirect descriptors,
only one slot is used in the ring, even for large packets.
The main effect is to improve the 0% packet loss benchma
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