Re: [RFC PATCH] arm64/fpsimd: Don't disable softirq when touching FPSIMD/SVE state
From: Julien Grall
Date: Thu Apr 11 2019 - 10:10:35 EST
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