On Tuesday 30 May 2006 23:19, Nate Lawson wrote: > Andriy Gapon wrote: > > on 29/05/2006 23:10 Nate Lawson said the following: > >> disable apic (hint.apic.0.disabled="1"). I isolated this a little while > >> ago to the change to enable LAPIC timer. However, there is currently no > >> easy way to disable the LAPIC timer with APIC enabled so you have to > >> disable APIC. jhb_at_ and I have been discussing how to do this better but > >> no easy answers apparently. > > > > I am not sure what I am talking about, but is it potentially possible to > > drive timer system by more than one clock, actively using the most > > precise of them at any particular moment ? So that if LAPIC timer stops > > i8254 can be used instead. > > That requires mixed mode delivery -- i8254 on legacy PIC irq and APIC > mode for other interrupts. jhb_at_ just killed this and isn't eager to add > it back. I'll let him explain if he has more to add. Namely that it is unreliable and expressly forbidden by the ACPI spec. -- John BaldwinReceived on Thu Jun 01 2006 - 18:42:59 UTC
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