From: Peter Maydell <peter.maydell@linaro.org>
To: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: "Emilio G. Cota" <cota@braap.org>,
"Richard Henderson" <rth@twiddle.net>,
"Laurent Vivier" <laurent@vivier.eu>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Alex Benn�e" <alex.bennee@linaro.org>,
qemu-devel <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] Benchmarking linux-user performance
Date: Fri, 10 Mar 2017 12:48:31 +0100 [thread overview]
Message-ID: <CAFEAcA9s0tHLYFwm+SP22ecB9uw1oyXdJSf5iG0iKzwRQuoGpQ@mail.gmail.com> (raw)
In-Reply-To: <20170310114531.GB2480@work-vm>
On 10 March 2017 at 12:45, Dr. David Alan Gilbert <dgilbert@redhat.com> wrote:
> * Emilio G. Cota (cota@braap.org) wrote:
>> x86_64 NBench Floating Point Performance
>> Host: Intel(R) Xeon(R) CPU E5-2690 0 @ 2.90GHz
>>
>> 1.88 +-+-+---+--+---+---+---+--+---+---+---+---+--+---+---+---+--+---+-+-+
>> | + + + *A*#*A* + + + + + + + + + + + + |
>> 1.86 +-+ *** *** +-+
>> | # # *A*#*** |
>> | *A*# # # ## *A* |
>> 1.84 +-+ # *A* *A* # +-+
>> | # # *A* |
>> 1.82 +-+ # # ## +-+
>> | # *A*# # |
>> 1.8 +-+ # # #*A* *A* +-+
>> | # *A* # # |
>> 1.78 +-+*A* # *A* # +-+
>> | # ***# # # |
>> | *A*#*A* # # |
>> 1.76 +-+ *** # # +-+
>> | + + + + + + + + + + + + + + *A* + + |
>> 1.74 +-+-+---+--+---+---+---+--+---+---+---+---+--+---+---+---+--+---+-+-+
>> v1.v1.v1.2v1.3v1.4v1.v1.6v1.7v2.0v2.1v2.v2.3v2.4v2.5v2.v2.7v2.8.0
>> QEMU version
>
> I'm assuming the dips are where QEMU fixed something and cared about corner
> cases/accuracy?
Given the scale on the LHS is from 1.74 to 1.88 my guess is that the
variation is in large part noise and the major thing is "our fp
performance is bounded by softfloat, which doesn't change and is
always very slow".
thanks
-- PMM
next prev parent reply other threads:[~2017-03-10 11:48 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-10 1:23 [Qemu-devel] Benchmarking linux-user performance Emilio G. Cota
2017-03-10 11:45 ` Dr. David Alan Gilbert
2017-03-10 11:48 ` Peter Maydell [this message]
2017-03-11 2:25 ` Emilio G. Cota
2017-03-11 15:02 ` Peter Maydell
2017-03-11 2:18 ` Emilio G. Cota
2017-03-14 17:06 ` Dr. David Alan Gilbert
2017-03-16 17:13 ` Emilio G. Cota
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