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Subject: Re: TSC as timecounter makes system lag [-> jhb]
To: Jia-Shiun Li <jiashiun@gmail.com>,
 freebsd-current <freebsd-current@freebsd.org>,
 John Baldwin <jhb@freebsd.org>
References: <CAHNYxxPy4K37jKzw0+s_AX8ha9yeB_S3dK46s4EuXjdNbULCmQ@mail.gmail.com>
 <CAHNYxxN1ftsbJpts_N1Dv8YE1xE7eZ0H2BYDPyWeA8Oou0xGqQ@mail.gmail.com>
From: Julian Elischer <julian@elischer.org>
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Date: Sun, 15 Jan 2017 13:03:21 +0800
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On 15/01/2017 10:11 AM, Jia-Shiun Li wrote:
> On Fri, Jan 13, 2017 at 8:26 AM, Jia-Shiun Li <jiashiun@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.
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