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Re: [Qemu-devel] [PATCH 2/2] exec: make address spaces 64-bit wide
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [PATCH 2/2] exec: make address spaces 64-bit wide |
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Date: |
Mon, 11 Nov 2013 11:15:59 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130923 Thunderbird/17.0.9 |
Il 10/11/2013 11:31, Michael S. Tsirkin ha scritto:
> > Reported-by: Luiz Capitulino <address@hidden>
> > Signed-off-by: Paolo Bonzini <address@hidden>
>
> So this causes a 12% performance regression on some TCG
> tests, I think we should look into a smarter
> datastructure to solve the issues.
It causes a 12% performance regression in a single testcase where KVM
has a 150x performance regression. This says a lot about the relevance
of the testcase.
In any case, I have patches to avoid the regression. For 1.7 we can
just revert the patches, for 1.8 we can apply this patch together with
the optimizations that avoid introducing a regression.
Paolo