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SubjectRe: clocksource change of behavior in 2.6.22 compared to 2.6.20 causes massive system clock slowdown
On Mon, 9 Jul 2007 16:27:59 +0200 "Alessandro Suardi" <alessandro.suardi@gmail.com> wrote:

> My oldish AMD K7-800's clock began falling behind after
> rebooting from 2.6.20 (and 109 days uptime with a spotless
> clock) into 2.6.22; time lost is about four minutes each hour.
>
> Turns out that 2.6.22 marks my TSC as unstable and starts
> using PIT instead. Rebooting 2.6.22 with clocksource=tsc
> gets the original stable system time back.
>
> Not sure whether this is supposed to be the default way of
> fixing the issue on older machines, though; if anyone sees
> a problem with this, I'm up for providing more information.
>
> [root@donkey ~]# cd /sys/devices/system/clocksource/clocksource0/
> [root@donkey clocksource0]# cat available_clocksource
> pit jiffies tsc
> [root@donkey clocksource0]# cat current_clocksource
> tsc
> [root@donkey clocksource0]# uname -a
> Linux donkey 2.6.22 #1 PREEMPT Mon Jul 9 13:26:38 CEST 2007 i686
> athlon i386 GNU/Linux
> [root@donkey clocksource0]# cat /proc/cpuinfo
> processor : 0
> vendor_id : AuthenticAMD
> cpu family : 6
> model : 4
> model name : AMD Athlon(tm) Processor
> stepping : 2
> cpu MHz : 800.068
> cache size : 256 KB
> fdiv_bug : no
> hlt_bug : no
> f00f_bug : no
> coma_bug : no
> fpu : yes
> fpu_exception : yes
> cpuid level : 1
> wp : yes
> flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca
> cmov pat pse36 mmx fxsr syscall mmxext 3dnowext 3dnow
> bogomips : 1603.17
> clflush size : 32
>

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