On 01/19/12 22:03, Andriy Gapon wrote:
on 19/01/2012 21:24 László Károlyi said the following:
On 2012.01.19., at 18:18, Andriy Gapon wrote:
Please provide output of the following sysctls:
sysctl kern.eventtimer
sysctl kern.timecounter
[root@sys ~]# sysctl kern.eventtimer
kern.eventtimer.choice: HPET(450) HPET1(450) HPET2(450) LAPIC(400) i8254(100)
RTC(0)
kern.eventtimer.et.LAPIC.flags: 15
kern.eventtimer.et.LAPIC.frequency: 0
kern.eventtimer.et.LAPIC.quality: 400
kern.eventtimer.et.i8254.flags: 1
kern.eventtimer.et.i8254.frequency: 1193182
kern.eventtimer.et.i8254.quality: 100
kern.eventtimer.et.HPET.flags: 3
kern.eventtimer.et.HPET.frequency: 14318180
kern.eventtimer.et.HPET.quality: 450
kern.eventtimer.et.HPET1.flags: 3
kern.eventtimer.et.HPET1.frequency: 14318180
kern.eventtimer.et.HPET1.quality: 450
kern.eventtimer.et.HPET2.flags: 3
kern.eventtimer.et.HPET2.frequency: 14318180
kern.eventtimer.et.HPET2.quality: 450
kern.eventtimer.et.RTC.flags: 17
kern.eventtimer.et.RTC.frequency: 32768
kern.eventtimer.et.RTC.quality: 0
kern.eventtimer.periodic: 0
kern.eventtimer.timer: HPET
kern.eventtimer.idletick: 0
kern.eventtimer.singlemul: 2
[root@sys ~]# sysctl kern.timecounter
kern.timecounter.tick: 1
kern.timecounter.choice: TSC-low(800) HPET(950) i8254(0) ACPI-fast(900)
dummy(-1000000)
kern.timecounter.hardware: HPET
kern.timecounter.stepwarnings: 0
kern.timecounter.tc.ACPI-fast.mask: 4294967295
kern.timecounter.tc.ACPI-fast.counter: 3649705857
kern.timecounter.tc.ACPI-fast.frequency: 3579545
kern.timecounter.tc.ACPI-fast.quality: 900
kern.timecounter.tc.i8254.mask: 65535
kern.timecounter.tc.i8254.counter: 27536
kern.timecounter.tc.i8254.frequency: 1193182
kern.timecounter.tc.i8254.quality: 0
kern.timecounter.tc.HPET.mask: 4294967295
kern.timecounter.tc.HPET.counter: 1224089625
kern.timecounter.tc.HPET.frequency: 14318180
kern.timecounter.tc.HPET.quality: 950
kern.timecounter.tc.TSC-low.mask: 4294967295
kern.timecounter.tc.TSC-low.counter: 1655163352
kern.timecounter.tc.TSC-low.frequency: 11772185
kern.timecounter.tc.TSC-low.quality: 800
kern.timecounter.smp_tsc: 1
kern.timecounter.invariant_tsc: 1
I wonder whether there could be an interference between HPET being used as
timecounter and HPET being used as an event timer.
Alexander, what do you think?
I don't expect interference between them. HPET timecounter just reads
same hardware counter that is also read by comparators for eventtimer
interrupts generation. Theoretically they could interfere if that timer
was stopped during comparators programming, but it is not.
László, can you please try changing kern.timecounter.hardware to TSC-low or
ACPI-fast?
--
Alexander Motin
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