On 15.08.2011 22:18, Joe Schaefer wrote:
On Mon, Aug 15, 2011 at 9:31 AM, Joe Schaefer<[email protected]> wrote:
On Mon, Aug 15, 2011 at 8:32 AM, Andriy Gapon<[email protected]> wrote:
on 13/08/2011 20:16 Joe Schaefer said the following:
Brand new machine with a Phenom II X6 1100T and under chronic load
the clock will stop running periodically until the machine eventually completely
freezes. Note: during these stalls the kernel is still running, the
machine is still
mostly responsive, it's just that the clock is frozen in time.
I've disabled Turbo mode in the bios and toyed with just about every
other setting but nothing seems to resolve this problem. Based on the behavior
of the machine (just making buildworld will eventually kill it, upping
the -j flag
just kills it faster), I'm guessing it has something to do with the
Digi+ VRM features
but again nothing I've tried modifying in the bios seems to help.
I've tried both 8.2-RELEASE and FreeBSD 9 (head). Running head now with
a dtrace enabled kernel.
Suggestions?
On head, start with checking what source is used for driving clocks:
sysctl kern.eventtimer
% sysctl kern.eventtimer [master]
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.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.i8254.flags: 1
kern.eventtimer.et.i8254.frequency: 1193182
kern.eventtimer.et.i8254.quality: 100
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
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Changing this to "i8254" seems to have resolved the stalls.
I'm running buildworld -j12 without issue. More than willing
to test out a patch or two against head if anyone's still
interested, otherwise I've thrown the change into loader.conf
and will move along quietly.
8.2-RELEASE you've mentioned doesn't have event timers subsystem and
HPET timer driver. That makes me think it is strange at least. Can you
try also LAPIC timer and do alike experiments with kern.timeocunter?
Also, please check whether kern.timecounter.tc.X.counter value changes
for the selected timercounter and whether you are receiving timer
interrupts in `vmstat -i`
--
Alexander Motin
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