Date: Tue, 30 May 2006 20:19:56 -0700 From: Nate Lawson <nate@root.org> To: Andriy Gapon <avg@icyb.net.ua> Cc: freebsd-current@freebsd.org Subject: Re: Freeze due to performance_cx_lowest=LOW Message-ID: <447D0B5C.3020901@root.org> In-Reply-To: <447C1BBD.5020004@icyb.net.ua> References: <1148837064.00534930.1148826605@10.7.7.3> <1148945069.00535906.1148934001@10.7.7.3> <447C1BBD.5020004@icyb.net.ua>
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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@ 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@ just killed this and isn't eager to add it back. I'll let him explain if he has more to add. -- Nate
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