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Re: [Qemu-devel] Benchmarking linux-user performance
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From: |
Peter Maydell |
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Subject: |
Re: [Qemu-devel] Benchmarking linux-user performance |
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Date: |
Fri, 10 Mar 2017 12:48:31 +0100 |
On 10 March 2017 at 12:45, Dr. David Alan Gilbert <address@hidden> wrote:
> * Emilio G. Cota (address@hidden) 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