on 20/06/2006 16:10 Andriy Gapon said the following: > Well, I think MP systems are "meant" to use lapic timer; anyway, I do > not care much for them now :-) But I am exploring possibilities to avoid > using lapic timer (or to augment it) on UP systems. And, as you confirm, > RTC seems to be a good candidate for that. > BTW, an interesting link here: http://www.microsoft.com/whdc/system/CEC/mm-timer.mspx Some quotes: 8254 PIT ... this timer is only used in periodic mode to provide the periodic clock interrupt on uni-processor systems. [in Windows] RTC ... The RTC is used in periodic mode to provide the system profiling interrupt on uni-processor systems and the clock interrupt on multi-processor systems. [in Windows] Not sure about their terminology and how up-to-date this document is, but I think that they use 8254 for hardclock on non-APIC systems and RTC on APIC systems in Windows XP. -- Andriy GaponReceived on Tue Jun 20 2006 - 15:15:44 UTC
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