Re: [ANNOUNCE] WireGuard Snapshot `0.0.20180708` Available

[Roman Mamedov <rm@romanrm.net>]

On Tue, 10 Jul 2018 16:57:14 +0200
"Jason A. Donenfeld" <Jason@zx2c4.com> wrote:

> The latest snapshot will still have the same preemption relaxation
> with simd_relax(), but gets performance gains by moving to napi, so
> it's still faster overall. If you want the simd_relax() to not take a
> hit and get maximum throughput, the right way of doing this is
> actually to just disable preemption in your kernel with
> PREEMPT_NONE=y.

I build a single kernel to use across a diverse park of machines, including
servers, routers -- and a few GUI desktops. It is not an option for me to
disable preemption entirely in that kernel. (And it would be a hassle to build
two or more kernels each time).

However those of my hosts which are routers with WG, are NOT the same hosts
which are interactive desktops. So I don't want any sacrifices towards
interactivity *in WG*.

I'll probably test again without simd_relax, but from the past mailing list
discussion it seemed like that one doesn't affect things much. In any case,
it's great that you found a way to keep performance and increase interactivity
at the same time with NAPI.

-- 
With respect,
Roman