Re: [PATCH] kbuild: move -pipe to global KBUILD_CFLAGS

[Alex Xu (Hello71)]

Excerpts from Nathan Chancellor's message of February 22, 2020 3:01 am:
> I used hyperfine [1] to run a quick benchmark with a freshly built
> GCC 9.2.0 for x86 and aarch64 and here are the results:
> 
> In both cases it seems like performance regresses (by 1% but still) but
> maybe it is my machine, even though this benchmark was done on a
> different machine than the one from my commit back in 2018.
> 
> I am not sure I would write off these results, since I did the benchmark
> 25 times on each one back to back, eliminating most of the variance that
> you described.
> 
> [1]: https://github.com/sharkdp/hyperfine
> 
> Cheers,
> Nathan
> 

What kernel version are you running? Do you have the 5.6 pipe reworks?