[ANNOUNCE] WireGuard Snapshot `0.0.20180620` Available
Jason A. Donenfeld
Jason at zx2c4.com
Thu Jun 21 01:47:10 CEST 2018
Thanks for helping to debug this.
On Thu, Jun 21, 2018 at 12:37 AM Lonnie Abelbeck
<lists at lonnie.abelbeck.com> wrote:
> Hunk #1 only does the trick, though performance is ever so slightly slower than before overall.
It's good to hear that hunks #2 and #3 don't have much an effect,
though it does still seem to have _some_ effect.
Looks like hunk 1 is rather worrisome though. Can you try out
https://א.cc/eaxxpxbB and let me know if it has any effect?
> Is this issue because our project uses CONFIG_PREEMPT=y ?
Yes, generally, preemption is good for latency but bad for throughput.
I was trying to make the queues a bit more preemption friendly, but
this seemed to have killed performance, so I'll be revisiting this,
because I don't want to make things worse than before.
I find it very strange that 20180531 is still faster than the last
patch I sent you. The only other difference along the hot path,
besides the last patch I sent you, between the two snapshots is
and this is _removing_ code, so I'd think this would actually
contribute to a speed increase, not a slight decrease. Are you sure
the benchmark conditions were the same in other respects?
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