Re: HRTimer causing rtctest to fail

2018-02-28 Thread Felipe Balbi
Hi, Thomas Gleixner writes: > On Wed, 28 Feb 2018, Felipe Balbi wrote: >> Thomas Gleixner writes: >> > All numbers in micro seconds! What happens if you load the system or >> > restrict C-States? >> >> added intel_idle.max_cstate=0 to cmdline. Still see

Re: HRTimer causing rtctest to fail

2018-02-28 Thread Felipe Balbi
Hi, Thomas Gleixner writes: > On Wed, 28 Feb 2018, Felipe Balbi wrote: >> Thomas Gleixner writes: >> > All numbers in micro seconds! What happens if you load the system or >> > restrict C-States? >> >> added intel_idle.max_cstate=0 to cmdline. Still see some failures, >> albeit a lot more

Re: HRTimer causing rtctest to fail

2018-02-28 Thread Thomas Gleixner
On Wed, 28 Feb 2018, Felipe Balbi wrote: > Thomas Gleixner writes: > > All numbers in micro seconds! What happens if you load the system or > > restrict C-States? > > added intel_idle.max_cstate=0 to cmdline. Still see some failures, > albeit a lot more rare, for example,

Re: HRTimer causing rtctest to fail

2018-02-28 Thread Thomas Gleixner
On Wed, 28 Feb 2018, Felipe Balbi wrote: > Thomas Gleixner writes: > > All numbers in micro seconds! What happens if you load the system or > > restrict C-States? > > added intel_idle.max_cstate=0 to cmdline. Still see some failures, > albeit a lot more rare, for example, caught one on iteration

Re: HRTimer causing rtctest to fail

2018-02-28 Thread Felipe Balbi
Thomas Gleixner writes: > On Wed, 28 Feb 2018, Felipe Balbi wrote: >> Thomas Gleixner writes: >> > Enable the hrtimer and scheduling tracepoints. That should give you a hint >> > what's going on. >> >> Thanks, that does give me a lot more information. So

Re: HRTimer causing rtctest to fail

2018-02-28 Thread Felipe Balbi
Thomas Gleixner writes: > On Wed, 28 Feb 2018, Felipe Balbi wrote: >> Thomas Gleixner writes: >> > Enable the hrtimer and scheduling tracepoints. That should give you a hint >> > what's going on. >> >> Thanks, that does give me a lot more information. So here you go: >> >>

Re: HRTimer causing rtctest to fail

2018-02-28 Thread Thomas Gleixner
On Wed, 28 Feb 2018, Felipe Balbi wrote: > Thomas Gleixner writes: > > Enable the hrtimer and scheduling tracepoints. That should give you a hint > > what's going on. > > Thanks, that does give me a lot more information. So here you go: > > rtctest-1348 [003] d..2

Re: HRTimer causing rtctest to fail

2018-02-28 Thread Thomas Gleixner
On Wed, 28 Feb 2018, Felipe Balbi wrote: > Thomas Gleixner writes: > > Enable the hrtimer and scheduling tracepoints. That should give you a hint > > what's going on. > > Thanks, that does give me a lot more information. So here you go: > > rtctest-1348 [003] d..2 313.766141:

Re: HRTimer causing rtctest to fail

2018-02-28 Thread Felipe Balbi
Hi, Thomas Gleixner writes: > On Tue, 27 Feb 2018, Felipe Balbi wrote: >> I'm facing an odd problem with v4.16-rc2 (also reproducible on v4.15 >> final) where rtctest fails sometimes which PIE coming too late with >> frequencies >= 1024 Hz. >> >> I've modified rtctest.c a

Re: HRTimer causing rtctest to fail

2018-02-28 Thread Felipe Balbi
Hi, Thomas Gleixner writes: > On Tue, 27 Feb 2018, Felipe Balbi wrote: >> I'm facing an odd problem with v4.16-rc2 (also reproducible on v4.15 >> final) where rtctest fails sometimes which PIE coming too late with >> frequencies >= 1024 Hz. >> >> I've modified rtctest.c a bit so that it

Re: HRTimer causing rtctest to fail

2018-02-27 Thread Thomas Gleixner
On Tue, 27 Feb 2018, Felipe Balbi wrote: > I'm facing an odd problem with v4.16-rc2 (also reproducible on v4.15 > final) where rtctest fails sometimes which PIE coming too late with > frequencies >= 1024 Hz. > > I've modified rtctest.c a bit so that it continues running even after > first failure

Re: HRTimer causing rtctest to fail

2018-02-27 Thread Thomas Gleixner
On Tue, 27 Feb 2018, Felipe Balbi wrote: > I'm facing an odd problem with v4.16-rc2 (also reproducible on v4.15 > final) where rtctest fails sometimes which PIE coming too late with > frequencies >= 1024 Hz. > > I've modified rtctest.c a bit so that it continues running even after > first failure

HRTimer causing rtctest to fail

2018-02-27 Thread Felipe Balbi
Hi folks, I'm facing an odd problem with v4.16-rc2 (also reproducible on v4.15 final) where rtctest fails sometimes which PIE coming too late with frequencies >= 1024 Hz. I've modified rtctest.c a bit so that it continues running even after first failure just so I could get a glimpse of how

HRTimer causing rtctest to fail

2018-02-27 Thread Felipe Balbi
Hi folks, I'm facing an odd problem with v4.16-rc2 (also reproducible on v4.15 final) where rtctest fails sometimes which PIE coming too late with frequencies >= 1024 Hz. I've modified rtctest.c a bit so that it continues running even after first failure just so I could get a glimpse of how