pthread_cond_timedwait() broken in 9-stable? [possible answer]

David Xu listlog2011 at
Fri Feb 17 02:00:05 UTC 2012

On 2012/2/17 9:55, Julian Elischer wrote:
> kern.timecounter.tick: 1
> kern.timecounter.choice: TSC-low(1000) i8254(0) HPET(950) 
> ACPI-fast(900) dummy(-1000000)
> kern.timecounter.hardware: ACPI-fast
> kern.timecounter.stepwarnings: 0
> switching the machine from TSC_low to ACPI-fast  fixes the problem.
> in 8.x it used to default to ACPI
> but I used to switch it to "TSC" to get better performance.
> I wonder why TSC-low is now bad to use..
> maybe the TSCs are not as well sychronised as they were in 8.x?
> maybe the pthreads code didn't get the memo about changing timers?
pthread code does not know timer setting, same as other code in kernel. ;-)

More information about the freebsd-stable mailing list