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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] x86/time: fix scale_delta() inline assembly
On 26/11/2012 17:12, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote: >> From: Sylvain Munaut [mailto:s.munaut@xxxxxxxxxxxxxxxxxxxx] >> Subject: Re: [Xen-devel] [PATCH] x86/time: fix scale_delta() inline assembly >> >> 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 ? > > I don't know, but I'd imagine there is something in the x86 platform > software (aka firmware) of those machines that runs and blocks execution > of Xen for long enough (via NMI/MCE/SMI) for the platform timer to > overflow, and this doesn't occur on other machines. It is just luck of the draw. There is no actual platform timer overflow happening when this bug triggers. -- Keir > Maybe Jan has a better idea... _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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