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xen-ia64-devel
RE: [Xen-ia64-devel] RE: rid virtualization
> > I think it would be worth changing the Xen mangling so that it
> > switches bytes 1 and 2 instead of 1 and 3, and seeing if that makes
> > an improvement.
> >
> > Matt
>
> Dan:
> I noticed the latest code is still mangling byte 1 with bytes 3
> so far. Don't you want to switch to byte 1 and byte 2 mangling that is
> obvious better than current one?
> Thx,eddie
Do you have any benchmark results comparing the two (preferably
with all the FAST_* options turned on in hyperprivop.S)? Also,
Matt observed that reversing all the bits should be even better.
It would be good to benchmark that too.
If you are looking at this code, please also look to see if
you find any places where rid mangling should be occuring
but is not (e.g. metaphysical mode). I think I saw a place
where this might be a bug when I was working on fixing another
bug, but don't recall where it was.
Thanks,
Dan
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