[sparc64] wrong uptime in 2.5.72

[sparc64] wrong uptime in 2.5.72

[Daniel Whitener]

I'm getting a bad uptime with 2.5.72... It comes up with 497 as soon as you 
boot (I've rebooted multiple times).  The problem wasn't there in 2.5.70. 
This machine is a Sun Ultra 5.

I found this mail in the archives that might help some...
http://www.ussg.iu.edu/hypermail/linux/kernel/0306.1/1698.html

sun root # uname -a
Linux sun.nowhere.net 2.5.72 #1 Tue Jun 17 10:25:45 EST 2003 sparc64 sun4u 
TI UltraSparc IIi GNU/Linux
sun root # uptime
  10:46:35 up 497 days,  2:24,  1 user,  load average: 0.28, 0.17, 0.07
sun root # cat /proc/uptime
42949481.55 77.26
sun root # cat /proc/stat
cpu  1382 0 1783 7626 466
cpu0 1382 0 1783 7626 466
intr 12650 11256 0 0 0 928 459 0 0 0 0 0 0 7 0 0 0
ctxt 14048
btime 1055864690
processes 4217
procs_running 2
procs_blocked 0
sun root # cat /proc/cpuinfo
cpu             : TI UltraSparc IIi
fpu             : UltraSparc IIi integrated FPU
promlib         : Version 3 Revision 25
prom            : 3.25.1
type            : sun4u
ncpus probed    : 1
ncpus active    : 1
Cpu0Bogo        : 719.25
Cpu0ClkTck      : 0000000015752a00
MMU Type        : Spitfire

Re: [sparc64] wrong uptime in 2.5.72

[george anzinger]

Daniel Whitener wrote:
> 
> I'm getting a bad uptime with 2.5.72... It comes up with 497 as soon as 
> you boot (I've rebooted multiple times).  The problem wasn't there in 
> 2.5.70. This machine is a Sun Ultra 5.
> 
> I found this mail in the archives that might help some...
> http://www.ussg.iu.edu/hypermail/linux/kernel/0306.1/1698.html

The system now uses the posix clock_monotonic clock to compute uptime. 
  This clock requires that the arch code (do_settime) keep track of 
time settings and back them out of "wall_to_monotonic".

There was also a recent change to set wall_to_monotonic to -(xtime) so 
that this clock would be 0 at boot time.  This is usually done in the 
arch/kernel/time.c code where xtime (i.e. the system time) is set 
during boot up.  Prior code set it to the initial jiffies value.  I 
suspect that this change did not get into your kernel.

-g
> 
> sun root # uname -a
> Linux sun.nowhere.net 2.5.72 #1 Tue Jun 17 10:25:45 EST 2003 sparc64 
> sun4u TI UltraSparc IIi GNU/Linux
> sun root # uptime
>  10:46:35 up 497 days,  2:24,  1 user,  load average: 0.28, 0.17, 0.07
> sun root # cat /proc/uptime
> 42949481.55 77.26
> sun root # cat /proc/stat
> cpu  1382 0 1783 7626 466
> cpu0 1382 0 1783 7626 466
> intr 12650 11256 0 0 0 928 459 0 0 0 0 0 0 7 0 0 0
> ctxt 14048
> btime 1055864690
> processes 4217
> procs_running 2
> procs_blocked 0
> sun root # cat /proc/cpuinfo
> cpu             : TI UltraSparc IIi
> fpu             : UltraSparc IIi integrated FPU
> promlib         : Version 3 Revision 25
> prom            : 3.25.1
> type            : sun4u
> ncpus probed    : 1
> ncpus active    : 1
> Cpu0Bogo        : 719.25
> Cpu0ClkTck      : 0000000015752a00
> MMU Type        : Spitfire
> 
> -
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-- 
George Anzinger   george@mvista.com
High-res-timers:  http://sourceforge.net/projects/high-res-timers/
Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml