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Date: Fri, 17 Feb 2012 10:00:00 +0800
From: David Xu <listlog2011@gmail.com>
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To: Julian Elischer <julian@freebsd.org>
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Cc: Alexander Kabaev <kan@freebsd.org>, threads@freebsd.org,
	FreeBSD Stable <freebsd-stable@freebsd.org>,
	David Xu <davidxu@freebsd.org>, Andriy Gapon <avg@freebsd.org>
Subject: Re: pthread_cond_timedwait() broken in 9-stable? [possible answer]
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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. ;-)