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* Andrew Morton <akpm@osdl.org> wrote: > If so, could that function use the PIT/pmtimer/etc for working out if > the TSC is bust, rather than directly using jiffies? there's no realiable way to figure out the TSC is bust: some CPUs have a slight 'skew' between cores for example. On some systems the TSC might skew between sockets. A CPU might break its TSC only once some powersaving mode has been activated - which might be long after bootup. The whole TSC business is a nightmare and cannot be supported reliably. AFAIK Windows doesnt use it, so it's a continuous minefield for new hardware to break. We should wait until CPU makers get their act together and implement a TSC variant that is /architecturally promised/ to have constant frequency (system bus frequency or whatever) and which never stops. Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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