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References: <1521663109-32262-1-git-send-email-cota@braap.org>
From: Alex =?utf-8?Q?Benn=C3=A9e?= <alex.bennee@linaro.org>
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Date: Thu, 22 Mar 2018 08:56:36 +0000
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Subject: Re: [Qemu-devel] [PATCH v1 00/14] fp-test + hostfloat
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To: "Emilio G. Cota" <cota@braap.org>
Cc: qemu-devel@nongnu.org, Aurelien Jarno <aurelien@aurel32.net>, Peter Maydell <peter.maydell@linaro.org>, Laurent Vivier <laurent@vivier.eu>, Richard Henderson <richard.henderson@linaro.org>, Paolo Bonzini <pbonzini@redhat.com>, Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>


Emilio G. Cota <cota@braap.org> writes:

<snip>
> For performance numbers see the last patch.

Just another random data point as we've been using himeno for our SVE
wor:

Master:

8:05:45  [alex@zen:~/l/q/qemu.git] master =C2=B1 ./aarch64-linux-user/qemu-=
aarch64 sve.demo/himeno-v80
mimax =3D 129 mjmax =3D 65 mkmax =3D 65
imax =3D 128 jmax =3D 64 kmax =3D64
cpu : 33.430299 sec.
Loop executed for 200 times
Gosa : 1.688752e-03
MFLOPS measured : 98.519585
Score based on MMX Pentium 200MHz : 3.052978

Host FPU:

08:25:03 [alex@zen:~/l/q/qemu.git] master =C2=B1 ./aarch64-linux-user/qemu-=
aarch64 sve.demo/himeno-v80
mimax =3D 129 mjmax =3D 65 mkmax =3D 65
imax =3D 128 jmax =3D 64 kmax =3D64
cpu : 15.067773 sec.
Loop executed for 200 times
Gosa : 1.688752e-03
MFLOPS measured : 218.581684
Score based on MMX Pentium 200MHz : 6.773526

Given SVE also beats v80 code thanks to avoiding marshalling overhead by
doing bigger vectors I expect that improvement to be even better. Once
the SVE patches are re-based I'll measure them.

By the way I've been talking to some of the people at connect about
tracking performance over time. I got pointed to LLVM's LNT tool
(example: https://lnt.llvm.org/) so I might see if I can get a server
set up that we can start pushing numbers to. Have you come across any
other such things?

--
Alex Benn=C3=A9e