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From: "Alex Xu (Hello71)" <alex_y_xu@yahoo.ca>
To: Nathan Chancellor <natechancellor@gmail.com>
Cc: Russell King <linux@armlinux.org.uk>,
	linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
	masahiroy@kernel.org, michal.lkml@markovi.net
Subject: Re: [PATCH] kbuild: move -pipe to global KBUILD_CFLAGS
Date: Sat, 22 Feb 2020 09:24:14 -0500
Message-ID: <1582381271.1karmgahx0.none@localhost> (raw)
In-Reply-To: <20200222080140.GA40311@ubuntu-m2-xlarge-x86>

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?

  reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200222003820.220854-1-alex_y_xu.ref@yahoo.ca>
2020-02-22  0:38 ` Alex Xu (Hello71)
2020-02-22  2:07   ` Masahiro Yamada
2020-02-22  9:01     ` Russell King - ARM Linux admin
2020-02-22  2:16   ` Nathan Chancellor
2020-02-22  4:01     ` Alex Xu (Hello71)
2020-02-22  8:01       ` Nathan Chancellor
2020-02-22 14:24         ` Alex Xu (Hello71) [this message]
2020-02-22 18:12           ` Nathan Chancellor

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