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| Started by | Jon Masters <jonathan@jonmasters.org> |
|---|---|
| First post | 2015-12-21 09:20 +0100 |
| Last post | 2015-12-21 23:00 +0100 |
| Articles | 2 — 2 participants |
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Re: Skylake (XPS 13 9350) TSC is way off Jon Masters <jonathan@jonmasters.org> - 2015-12-21 09:20 +0100
Re: Skylake (XPS 13 9350) TSC is way off John Stultz <john.stultz@linaro.org> - 2015-12-21 23:00 +0100
| From | Jon Masters <jonathan@jonmasters.org> |
|---|---|
| Date | 2015-12-21 09:20 +0100 |
| Subject | Re: Skylake (XPS 13 9350) TSC is way off |
| Message-ID | <qI3Rg-40k-7@gated-at.bofh.it> |
On 12/2/15, 6:55 PM, John Stultz wrote: > On Wed, Dec 2, 2015 at 3:42 PM, Andy Lutomirski <luto@kernel.org> wrote: >>> On a hunch, are you running chrony instead of ntpd? >> >> Yes, this is indeed chrony. > > Ok. I'll have to look closer. The last time that message came up it > was in a report of a bug that chrony uncovered with the internal > correction being too slow. I know chrony is much more aggressive > compared to ntpd in tweaking the freq value for the initial converging > correction at startup, so maybe that along with something else is > causing us to get out of spec. Can you copy me on followup? I'm seeing similar behavior with chrony on recent kernels on a couple of different ARM server prototype systems. Jon. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | John Stultz <john.stultz@linaro.org> |
|---|---|
| Date | 2015-12-21 23:00 +0100 |
| Message-ID | <qIgEP-3vy-45@gated-at.bofh.it> |
| In reply to | #1295815 |
On Mon, Dec 21, 2015 at 12:10 AM, Jon Masters <jonathan@jonmasters.org> wrote: > On 12/2/15, 6:55 PM, John Stultz wrote: >> >> On Wed, Dec 2, 2015 at 3:42 PM, Andy Lutomirski <luto@kernel.org> wrote: > > >>>> On a hunch, are you running chrony instead of ntpd? >>> >>> >>> Yes, this is indeed chrony. >> >> >> Ok. I'll have to look closer. The last time that message came up it >> was in a report of a bug that chrony uncovered with the internal >> correction being too slow. I know chrony is much more aggressive >> compared to ntpd in tweaking the freq value for the initial converging >> correction at startup, so maybe that along with something else is >> causing us to get out of spec. > > > Can you copy me on followup? I'm seeing similar behavior with chrony on > recent kernels on a couple of different ARM server prototype systems. A patch for this just landed in tip/timers/core and is pending for 4.5 http://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?id=ec02b076ceab63f99e5b3d80fd223d777266c236 thanks -john -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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