[LTP] [patch V2 00/20] timer: Refactor the timer wheel

Mike Galbraith
2016-06-22T13:37:47Z

On Wed, 2016-06-22 at 11:06 +0200, Mike Galbraith wrote:
> On Wed, 2016-06-22 at 10:44 +0200, Thomas Gleixner wrote:
> > B1;2802;0cOn Wed, 22 Jun 2016, Mike Galbraith wrote:
> > > FWIW, testing with ltp, I noticed a new failure in logs. It turns
> > out
> > > to be intermittent, but the testcase mostly fails.
> >
> > You forgot to cc the LTP folks ...
>
> This ain't the only one, it's just new. I'll mention it.
>
> File under FYI/FWIW: I also plugged the set into RT, and nothing fell
> out of local boxen. The below is falling out of my 8 socket box
> though.. maybe a portage booboo.
>
> [ 1503.988863] clocksource: timekeeping watchdog on CPU42: Marking clocksource 'tsc' as unstable because the skew is too large:
> [ 1504.203800] clocksource: 'hpet' wd_now: 38b55bb wd_last: 8303f269 mask: ffffffff
> [ 1504.296111] clocksource: 'tsc' cs_now: 3a3aa717794 cs_last: 354624eea7b mask: ffffffffffffffff
> [ 1504.402329] clocksource: Switched to clocksource hpet

Nope, not RT portage booboo. Virgin x86-tip/WIP.timers..

vogelweide:~/:[130]# dmesg|grep clocksource:
[ 0.000000] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1910969940391419 ns
[ 0.000000] clocksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 133484882848 ns
[ 5.608205] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1911260446275000 ns
[ 9.151208] clocksource: Switched to clocksource hpet
[ 9.485907] clocksource: acpi_pm: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns: 2085701024 ns
[ 11.947226] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x20974986637, max_idle_ns: 440795286310 ns
[ 13.012145] clocksource: Switched to clocksource tsc
[ 434.868215] clocksource: timekeeping watchdog on CPU59: Marking clocksource 'tsc' as unstable because the skew is too large:
[ 434.982251] clocksource: 'hpet' wd_now: 732cdf37 wd_last: df3d99d8 mask: ffffffff
[ 435.085875] clocksource: 'tsc' cs_now: 16e6780d1eb cs_last: 11326fa576e mask: ffffffffffffffff
[ 435.211249] clocksource: Switched to clocksource hpet
vogelweide:~/:[0]#