Re: [RFC PATCH] arm64/fpsimd: Don't disable softirq when touching FPSIMD/SVE state

[Julien Grall]

Hi Dave,

On 4/4/19 11:52 AM, Dave Martin wrote:
> On Fri, Feb 08, 2019 at 04:55:13PM +0000, Julien Grall wrote:
> I'm not sure how this patch will affect context switch overhead, so it
> would be good to see hackbench numbers (or similar).

I finally have some numbers for this patch. The benchmark was ran using 
Linux 5.1-rc4 and defconfig.

On Juno2:
   * hackbench 100 process 1000 (10 times)
   * .7% quicker

On ThunderX 2:
   * hackbench 1000 process 1000 (20 times)
   * 3.4% quicker

I am happy to try other benchmark if you think it is useful.

Anyway, I will resend the series with the comments addressed.

Cheers,

--
Julien Grall