[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCHv1] x86: only check for one watchdog NMI
>>> On 22.06.15 at 18:21, <david.vrabel@xxxxxxxxxx> wrote: > Since the NMI handler can now recognize watchdog NMIs, make > check_nmi_watchdog() only check for at least one watchdog NMI. This > prevents false negatives caused by other processors (which may be > being power managed by the BIOS) running at reduced clock frequencies. Doesn't this go a little too far, in that it allows through the case where an NMI works exactly once (a behavior not unheard of)? Lowering the count to e.g. 3 would seem acceptable, but not any further. Raising the wait time might then need to be the way to go if the (approximate) 1:3 ratio still isn't enough to cope with BIOS power managed CPUs. Btw., can an OS know of the power state CPUs come up in? I.e. can the wait time be adjusted dynamically? Or is this (perhaps intentionally) completely transparent to the OS? Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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