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Dell has taken to modifying the TSC rate on the fly, so it no longer is a constant which makes this much worse than it first was. Since HPET is also unstable as far as the kernel is concerned, it never settles, and will eventually revert to clocksource=tsc. Turning off virtualization just made the kernel realize that hpet was unreliable faster, and it switches back to TSC, which is also unreliable. But ptpd/timekeeper compensates for that.<br />Anonymoushttps://www.blogger.com/profile/08612263146373902842noreply@blogger.comtag:blogger.com,1999:blog-6270591920582469905.post-7285538822622487812017-11-08T07:38:37.994-08:002017-11-08T07:38:37.994-08:00On skylake cores, the vdso times out and always ca...On skylake cores, the vdso times out and always calls the syscall (tested in 4.9.54) since it wants to talk to the hypervisor (that isn't there). disable virtualization and the cycles count for clock_gettime() drops from 6900 cycles to 59 cycles.Anonymoushttps://www.blogger.com/profile/08612263146373902842noreply@blogger.com