Re: [4.14] Failing selftest timer/adjtick

Joerg Vehlow
2021-02-11T10:35:39Z

Hi Miroslav,

On 2/10/2021 2:19 PM, Miroslav Lichvar wrote:
> That patch cannot be applied alone. It would break the timekeeping in
> not so obvious ways as there will be unexpected sources of the NTP
> tracking error. IIRC, at least the following changes would need to be
> included with it. There may be others.
>
> c2cda2a5bda9 ("timekeeping/ntp: Don't align NTP frequency adjustments to ticks")
> aea3706cfc4d ("timekeeping: Remove CONFIG_GENERIC_TIME_VSYSCALL_OLD")
> d4d1fc61eb38 ("ia64: Update fsyscall gettime to use modern vsyscall_update")
>
> My suggestion for a fix would be to increase the limit in the failing
> test.
Thanks, that's what I expected. But I still wonder why the test is
failing almost 100% of time for me on qemu-arm64 (running on x86). Is
this a regression in 4.14, that was working at some point or was it
never tested on arm?

Joerg