Re: [RFC/RFT] calloutng

Alexander Motin <mav_at_FreeBSD.org> wrote:

> Experiments with dummynet shown ineffective support for very short 
> tick-based callouts. New version fixes that, allowing to get as many 
> tick-based callout events as hz value permits, while still be able to 
> aggregate events and generating minimum of interrupts.
> 
> Also this version modifies system load average calculation to fix some 
> cases existing in HEAD and 9 branches, that could be fixed with new 
> direct callout functionality.
> 
> http://people.freebsd.org/~mav/calloutng_12_17.patch

With this patch (and the previous one, I didn't test the others)
my mouse cursor is occasionally not reacting for short amounts of
time (less than a second, but long enough to be noticeable).

Every now and then the window manager (i3-wm) changes window focus
which could be explained by either phantom keyboard or mouse input,
or terminal lines are marked as if the cursor was moved with the
left button pressed.

The problems happen a couple of times per hour but I haven't
been able to intentionally reproduce them. They only seem to
occur while I'm moving the cursor, but of course I wouldn't
otherwise notice a unresponsive cursor anyway.

While the cursor is unresponsive, keyboard input and the rest
of the system works as expected as far as I can tell.

If I set debug.psm.loglevel=4 I get a "psm0: lost interrupt?"
message once per second when not moving the mouse, however that
also happens without the patch and thus might be unrelated.

I'm using moused.

I'm not sure what additional information is necessary to debug this,
so here a bunch of sysctl values that may or may not be relevant:

fk_at_r500 ~ $sysctl kern.eventtimer kern.timecounter
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: 440
kern.eventtimer.et.HPET2.flags: 3
kern.eventtimer.et.HPET2.frequency: 14318180
kern.eventtimer.et.HPET2.quality: 440
kern.eventtimer.et.HPET3.flags: 3
kern.eventtimer.et.HPET3.frequency: 14318180
kern.eventtimer.et.HPET3.quality: 440
kern.eventtimer.choice: HPET(450) HPET1(440) HPET2(440) HPET3(440) i8254(100)
kern.eventtimer.singlemul: 2
kern.eventtimer.idletick: 0
kern.eventtimer.activetick: 1
kern.eventtimer.timer: HPET
kern.eventtimer.periodic: 0
kern.timecounter.tc.i8254.mask: 65535
kern.timecounter.tc.i8254.counter: 25970
kern.timecounter.tc.i8254.frequency: 1193182
kern.timecounter.tc.i8254.quality: 0
kern.timecounter.tc.HPET.mask: 4294967295
kern.timecounter.tc.HPET.counter: 3963519587
kern.timecounter.tc.HPET.frequency: 14318180
kern.timecounter.tc.HPET.quality: 950
kern.timecounter.tc.ACPI-fast.mask: 16777215
kern.timecounter.tc.ACPI-fast.counter: 7323739
kern.timecounter.tc.ACPI-fast.frequency: 3579545
kern.timecounter.tc.ACPI-fast.quality: 900
kern.timecounter.tc.TSC.mask: 4294967295
kern.timecounter.tc.TSC.counter: 454465294
kern.timecounter.tc.TSC.frequency: 1995040520
kern.timecounter.tc.TSC.quality: -1000
kern.timecounter.stepwarnings: 0
kern.timecounter.hardware: HPET
kern.timecounter.choice: TSC(-1000) ACPI-fast(900) HPET(950) i8254(0) dummy(-1000000)
kern.timecounter.tick: 1
kern.timecounter.fast_gettime: 1
kern.timecounter.invariant_tsc: 1
kern.timecounter.smp_tsc: 0

The system is a Lenovo R500 with a
Intel(R) Core(TM)2 Duo CPU T5870  _at_ 2.00GHz (1995.04-MHz K8-class CPU)

Fabian