Subject: Re: [patch net-next] virtio_net: add support for Byte Queue Limits

From: "Michael S. Tsirkin" <[email-masked]>
Date: Thu, 6 Jun 2024 02:05:20 -0400

On Thu, Jun 06, 2024 at 12:25:15PM +0800, Jason Wang wrote:
> > If the codes of orphan mode don't have an impact when you enable
> > napi_tx mode, please keep it if you can.
> 
> For example, it complicates BQL implementation.
> 
> Thanks

I very much doubt sending interrupts to a VM can
*on all benchmarks* compete with not sending interrupts.

So yea, it's great if napi and hardware are advanced enough
that the default can be changed, since this way virtio
is closer to a regular nic and more or standard
infrastructure can be used.

But dropping it will go against *no breaking userspace* rule.
Complicated? Tough.

-- 
MST