On Tue, Oct 17, 2023 at 11:06:42PM +0800, kernel test robot wrote:
>
>
> Hello,
>
> kernel test robot noticed a -99.8% regression of stress-ng.splice.ops_per_sec on:
>
>
> commit: 1b057bd800c3ea0c926191d7950cd2365eddc9bb ("drivers/char/mem: implement splice() for /dev/zero, /dev/full")
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
>
> testcase: stress-ng
> test machine: 64 threads 2 sockets Intel(R) Xeon(R) Gold 6346 CPU @ 3.10GHz (Ice Lake) with 256G memory
> parameters:
>
> nr_threads: 100%
> testtime: 60s
> class: pipe
> test: splice
> cpufreq_governor: performance
>
>
> In addition to that, the commit also has significant impact on the following tests:
>
> +------------------+-------------------------------------------------------------------------------------------------+
> | testcase: change | stress-ng: stress-ng.splice.ops_per_sec 38.9% improvement |
So everything now goes faster, right? -99.8% regression means 99.8%
faster?
thanks,
greg k-h
