On Tue, 19 Oct 2021 at 03:32, Maciej W. Rozycki [off-list ref] wrote:

On Wed, 13 Oct 2021, Zhou Yanjie wrote:

quoted

quoted

quoted

can people, who provided performance numbers for v1 do the same for v2 ?

Sure, I will test the v2 in the next few days.

Sorry for the delay, It took a lot of time to migrate the environment to my
new computer, here is the results:


Score Without Patches  Score With Patches  Performance Change SoC Model
       105.9                102.1              -3.6%  JZ4775
       132.4                124.1              -6.3%  JZ4780(SMP off)
       170.2                155.7             -8.5%  JZ4780(SMP on)
       101.3                 91.5              -9.7%  X1000E
       187.1                179.4              -4.1%  X1830
       324.9                314.3              -3.3%  X2000(SMT off)
       394.6                373.9              -5.2%  X2000(SMT off)


Compared with the V1 version, there are some improvements, but the performance
loss is still a bit obvious

 The MIPS port of Linux has always had the pride of having a particularly
low syscall overhead and I'd rather we didn't lose this quality.

Hi, Maciej,

1. The current trend is to use generic code, so I think this work is
worth it, even if there is some performance loss.
2. We tested the performance on 5.15-rc1~rc5 and the performance
loss on JZ4780 (SMP off) is not so obvious (about -3%).
3. Yanjie, is there any problem with the code base you tested?
Could you help to test patch v3 on the latest mainline kernel?

Thanks,
Feiyang

 FWIW,

  Maciej