TSC as timecounter makes system lag [-> jhb]

Julian Elischer julian at elischer.org
Sun Jan 15 05:03:33 UTC 2017


On 15/01/2017 10:11 AM, Jia-Shiun Li wrote:
> On Fri, Jan 13, 2017 at 8:26 AM, Jia-Shiun Li <jiashiun at gmail.com> wrote:
>
>> Hi all,
>>
>> since 2 or 3 weeks ago, I noticed that my old Penryn-based Intel Pentium
>> T4200 notebook lagged a lot. System time was running a lot slower,
>> sometimes even looked like it freezed. Keystroke repeat rate was slow too.
>>
>> Since system time is slow, I tried to change timecounter from default TSC
>> to HPET. And it resumed normal immediately.
>>
>>
> Did a binary search. Turns out it was caused by r310177 "Enable
> EARLY_AP_STARTUP on amd64 and i386 kernels by default." r310175 does not
> have this issue. Removing this option from kernel config also solves it.

making sure jhb notices this.
> -Jia-Shiun.
> _______________________________________________
> freebsd-current at freebsd.org mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-current
> To unsubscribe, send any mail to "freebsd-current-unsubscribe at freebsd.org"




More information about the freebsd-current mailing list