Re: [Qemu-devel] Performance difference between QEMU 2.2.0 and 2.6.0

[Wenwen Wang]

Hi Peter,

Thanks for your suggestions! Will test some newer versions.

Best,
Wenwen

On Wed, Mar 8, 2017 at 2:42 PM, Peter Maydell <address@hidden>
wrote:

> On 8 March 2017 at 18:17, Wenwen Wang <address@hidden> wrote:
> > I just found that there is a significant performance difference between
> QEMU
> > version 2.2.0 and 2.6.0.
> >
> > Here are the execution times of the benchmark 458.sjeng from SPEC
> CINT2006
> > with test workload using user only emulation from ARM guest to x86-32
> host:
> >
> > qemu-2.2.0: 29 seconds
> > qemu-2.6.0: 38 seconds
>
> 2.6.0 is now quite old -- it would be interesting to test this on
> the current git master.
>
> > Could anyone tell me what this difference comes from or give me any hint?
>
> There are lots of changes between those two releases, and we don't
> in general track performance at all, so a regression is not very
> surprising to me. If you wanted to try to identify what caused it
> you could try a git bisect.
>
> thanks
> -- PMM
>