On Mon, 2015-09-21 at 22:54 +0200, Francois Romieu wrote:
> David Woodhouse :
> [...]
> > I'm actually having second thoughts about this one since realising that
> > QEMU doesn't implement it correctly. The workaround isn't *that* horrid
> > but it's not clear it's enough of a performance win — or
David Woodhouse :
[...]
> I'm actually having second thoughts about this one since realising that
> QEMU doesn't implement it correctly. The workaround isn't *that* horrid
> but it's not clear it's enough of a performance win — or whether it's
> entirely necessary for catching my TX stall.
It don
From: David Woodhouse
This is a minor optimisation, but as a side-effect it means we can know
precisely which descriptors were already in the ring when we last
prodded it to run.
This will give us a better chance to catch the case where we get a
TxEmpty interrupt when it hasn't actually finished
