On Wed, 11 Oct 2006, Andrew Morton wrote:
> So this patch has the potential to screw up people who have 2-way or 4-way,
> no hpet/pm-timer and dodgy TSCs.
Note that all APIC-based SMP systems (even these rare i486 beasts) by
definition do have local APIC timers, one per CPU, with a reasonable
resolution which could likely be used instead. There is an erratum in
some early Pentium integrated APICs, where a tick is lost when 0 is
reached (the timer counts downwards), so it may be needed to be taken into
account for good timekeeping, but otherwise the timers look like a
reasonable choice. The timers are local to their respective CPUs and are
never written by Linux (see references to APIC_TMCCT), so there is no need
for locking to access them.
Maciej
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