From: Nathan Chancellor <natechancellor@gmail.com>
To: "Alex Xu (Hello71)" <alex_y_xu@yahoo.ca>
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 11:12:49 -0700 [thread overview]
Message-ID: <20200222181249.GA23843@ubuntu-m2-xlarge-x86> (raw)
In-Reply-To: <1582381271.1karmgahx0.none@localhost>
On Sat, Feb 22, 2020 at 09:24:14AM -0500, Alex Xu (Hello71) wrote:
> 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?
No, it is a stock Ubuntu 18.04 kernel, which is running 4.15.0.
$ uname -a
Linux c2-medium-x86 4.15.0-50-generic #54-Ubuntu SMP Mon May 6 18:46:08 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
If you are curious about the specs:
$ neofetch --stdout
nathan@c2-medium-x86
--------------------
OS: Ubuntu 18.04.3 LTS x86_64
Host: PowerEdge R6415
Kernel: 4.15.0-50-generic
Uptime: 126 days, 12 hours, 39 mins
Packages: 686
Shell: zsh 5.4.2
Terminal: /dev/pts/0
CPU: AMD EPYC 7401P 24- (48) @ 2.794GHz
Memory: 2974MiB / 64018MiB
Cheers,
Nathan
prev parent reply other threads:[~2020-02-22 18:13 UTC|newest]
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 ` [PATCH] kbuild: move -pipe to global KBUILD_CFLAGS 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)
2020-02-22 18:12 ` Nathan Chancellor [this message]
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