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Subject: Re: [virtio-comment] Re: [PATCH] virtio-net: define feature of per-packet RSS hash delivery


On Fri, Dec 13, 2019 at 10:21:53AM +0200, Yuri Benditovich wrote:
> On Fri, Dec 13, 2019 at 9:16 AM Michael S. Tsirkin <mst@redhat.com> wrote:
> >
> > On Fri, Dec 13, 2019 at 06:34:39AM +0200, Yuri Benditovich wrote:
> > >
> > > So there are 2 possible profiles of devices that 'do not have RSS' but
> > > deliver hash:
> > > 1. The device is in general can do RSS, but has only one pair of
> > > queues and does only hash calculation
> > > 2. The device has multiple queues but is configured to do auto
> > > steering and we want also hash from it.
> > >
> > > My impression is that case 2 is rather academic one (at least looking forward).
> > > Do you agree?
> >
> > I am not sure I agree. auto mq is much easier to configure than RSS
> > so I image it's useful even if one wants hash.
> 
> With RSS and hash delivery we're mainly targeting virtio-net in hardware.
> Auto mq is much more complicated, correct?

Hardware implementing it exists, it's not too hard, just some tables
to maintain.

> >
> > --
> > MST
> >



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