On Thu, 2016-05-19 at 11:12 -0700, David Miller wrote:
> From: Eric Dumazet <eric.duma...@gmail.com>
> Date: Thu, 19 May 2016 10:08:36 -0700
>
> > busylock was added at the time we had expensive ticket spinlocks
> >
> > (commit 79640a4ca6955e3ebdb7038508fa7a0cd7fa5527 ("net: add additional
> > lock to qdisc to increase throughput")
> >
> > Now kernel spinlocks are MCS, this busylock things is no longer
> > relevant. It is slowing down things a bit.
> ...
> > That would be a 8 % increase.
>
> Presumably only for x86-64 and other platforms that actually are using
> the ticket spinlocks.
>
> For others it would be a regression.
Ticket spinlocks are actually gone, these are now MCS.
But yes, point taken ;)
