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Re: [Qemu-devel] Re: branches are expensive
From: |
Laurent Desnogues |
Subject: |
Re: [Qemu-devel] Re: branches are expensive |
Date: |
Thu, 19 Mar 2009 11:30:52 +0100 |
On Thu, Mar 19, 2009 at 11:07 AM, Steffen Liebergeld <address@hidden> wrote:
>
> I've tested Qemu 0.10.0 and with i386-softmmu on a i386 host I get the
> following numbers:
> direct jump count 70%, 2 jumps 54%
>
> For qemu-system-arm on an ARM host, the numbers look like this:
> direct jump count 47%, 2 jumps 40%
>
> For completeness I tested qemu-system-arm on a i386 host as well:
> direct jump count 44%, 2 jumps 37%
>
> So it looks like the chaining on ARM targets is not as effective as on i386
> targets (regardless of the guest, I used the same guest setup, compiled for
> different architectures, on all tests). Do you have any ideas why this is the
> case?
Different instruction sets, different compilers. You'd better compare
guest code before drawing any conclusion.
Laurent
- [Qemu-devel] branches are expensive, Steffen Liebergeld, 2009/03/17
- Re: [Qemu-devel] branches are expensive, Avi Kivity, 2009/03/17
- [Qemu-devel] Re: branches are expensive, Jan Kiszka, 2009/03/17
- [Qemu-devel] Re: branches are expensive, Steffen Liebergeld, 2009/03/17
- Re: [Qemu-devel] Re: branches are expensive, Paul Brook, 2009/03/17
- Re: [Qemu-devel] Re: branches are expensive, Avi Kivity, 2009/03/17
- [Qemu-devel] Re: branches are expensive, Steffen Liebergeld, 2009/03/19
- Re: [Qemu-devel] Re: branches are expensive,
Laurent Desnogues <=
- [Qemu-devel] Re: branches are expensive, Steffen Liebergeld, 2009/03/19
- Re: [Qemu-devel] Re: branches are expensive, Laurent Desnogues, 2009/03/19
- Re: [Qemu-devel] Re: branches are expensive, Avi Kivity, 2009/03/19
- Re: [Qemu-devel] Re: branches are expensive, Paul Brook, 2009/03/19
[Qemu-devel] Re: branches are expensive, Steffen Liebergeld, 2009/03/17
Re: [Qemu-devel] branches are expensive, Laurent Desnogues, 2009/03/17