On 2017-01-14 23:03, Julian Elischer wrote:
On 15/01/2017 10:11 AM, Jia-Shiun Li wrote:
On Fri, Jan 13, 2017 at 8:26 AM, Jia-Shiun Li <jiash...@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.
FWIW, I noted similar "slowness", and nooptions EARLY_AP_STARTUP makes it "normal"

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FreeBSD 12.0-CURRENT #13 r311997: Sat Jan 14 22:35:29 CST 2017
    r...@borg.lerctr.org:/usr/obj/usr/src/sys/VT-LER amd64
FreeBSD clang version 3.9.1 (tags/RELEASE_391/final 289601) (based on LLVM 3.9.1)
        MEMGUARD map base: 0xfffffe0000400000
        MEMGUARD map size: 128600960 KBytes
VT(vga): resolution 640x480
CPU: Intel(R) Xeon(R) CPU E5410 @ 2.33GHz (2327.55-MHz K8-class CPU)
  Origin="GenuineIntel"  Id=0x10676  Family=0x6  Model=0x17  Stepping=6
  AMD Features=0x20100800<SYSCALL,NX,LM>
  AMD Features2=0x1<LAHF>
  TSC: P-state invariant, performance statistics
real memory  = 68719476736 (65536 MB)
avail memory = 65353601024 (62326 MB)
Event timer "LAPIC" quality 100
ACPI APIC Table: <PTLTD          APIC  >
FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs

Larry Rosenman                     http://people.freebsd.org/~ler
Phone: +1 214-642-9640                 E-Mail: l...@freebsd.org
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