[Intel-wired-lan] [next-queue RFC 0/4] ethtool: Add support for frame preemption

Jakub Kicinski kuba at kernel.org
Mon May 18 22:22:59 UTC 2020


On Mon, 18 May 2020 15:06:26 -0700 Vinicius Costa Gomes wrote:
> Jakub Kicinski <kuba at kernel.org> writes:
> >
> > Please take a look at the example from the cover letter:
> >
> > $ ethtool $ sudo ./ethtool --show-frame-preemption
> > enp3s0 Frame preemption settings for enp3s0:
> > 	support: supported
> > 	active: active
> > 	supported queues: 0xf
> > 	supported queues: 0xe
> > 	minimum fragment size: 68
> >
> > Reading this I have no idea what 0xe is. I have to go and query TC API
> > to see what priorities and queues that will be. Which IMHO is a strong
> > argument that this information belongs there in the first place.  
> 
> That was the (only?) strong argument in favor of having frame preemption
> in the TC side when this was last discussed.
> 
> We can have a hybrid solution, we can move the express/preemptible per
> queue map to mqprio/taprio/whatever. And have the more specific
> configuration knobs, minimum fragment size, etc, in ethtool.
> 
> What do you think?

Does the standard specify minimum fragment size as a global MAC setting?


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