Re: [Xen-devel] [PATCH] x86/time: fix scale_delta() inline assembly

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 26.11.12 at 17:51, Sylvain Munaut <s.munaut@xxxxxxxxxxxxxxxxxxxx> wrote:
> I've just deployed this to a couple test servers that exhibited the problem.
> 
> What I don't really understand is why are some HW affected and not others ?

The multiplication is most likely to produce a zero upper half when
the multiplier is close to its smallest possible value (0x80000000);
as soon as the upper half is non-zero, chances shrink dramatically
for the warp value to be less than the current one.

Jan


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