Hello list! I am running Xenomai 3.0.7. released version with Kernel 4.9.90 patchlevel 6.
We have a new x86-64 hardware, and during a test-run the clocksource went unstable, see (1) below for dmesg. After this, calls to "clock_gettime(CLOCK_HOST_REALTIME,&timeStamp)" went bananas. Like if time stopped completely, (or possibly jumped back in time at least a few hours). Stuff running on timers (using CLOCK_MONOTONIC)kept running fine. I tried switching time to hpet using "clocksource=hpet" but this didn't work at all. Either time (CLOCK_HOST_REALTIME) jumped back and forth or it completely stopped. Now I'm using "tsc=reliable" and haven't seen any issues since. I think I know why tsc may be deemed unreliable, but why can't I run using hpet? What are the drawbacks for xenomai with using tsc=reliable ? ----------------- (1) ----------------- [19139.502750] clocksource: timekeeping watchdog on CPU3: Marking clocksource 'tsc' as unstable because the skew is too large: [19139.503499] clocksource: 'hpet' wd_now: f347622d wd_last: 35ab9afb mask: ffffffff [19139.504245] clocksource: 'tsc' cs_now: 31567c07fb36 cs_last: 30ffd3d5ec2d mask: ffffffffffffffff [19139.505045] clocksource: Switched to clocksource hpet ----------------- (1) ----------------- Best regards Per Öberg
