Re: [PATCH v2 3/6] net: ocelot: pre-compute injection frame header content

Clément Léger
2021-11-15T14:10:46Z

Le Mon, 15 Nov 2021 06:08:00 -0800,
Jakub Kicinski <kuba@kernel.org> a écrit :

> On Mon, 15 Nov 2021 11:13:44 +0100 Clément Léger wrote:
> > Test on standard packets with UDP (iperf3 -t 100 -l 1460 -u -b 0 -c *)
> > - With pre-computed header: UDP TX: 33Mbit/s
> > - Without UDP TX: 31Mbit/s
> > -> 6.5% improvement
> >
> > Test on small packets with UDP (iperf3 -t 100 -l 700 -u -b 0 -c *)
> > - With pre-computed header: UDP TX: 15.8Mbit/s
> > - Without UDP TX: 16.4Mbit/s
> > -> 4.3% improvement
>
> Something's wrong with these numbers or I'm missing context.
> You say improvement in both cases yet in the latter case the
> new number is lower?

You are right Jakub, I swapped the last two results,

Test on small packets with UDP (iperf3 -t 100 -l 700 -u -b 0 -c *)
- With pre-computed header: UDP TX: 16.4Mbit/s
- Without UDP TX: 15.8Mbit/s
-> 4.3% improvement

--
Clément Léger,
Embedded Linux and Kernel engineer at Bootlin