Re: too short/too long (sys/kern_tc.c)

From: Eric Anderson <anderson_at_freebsd.org>
Date: Tue, 27 Feb 2007 10:10:29 -0600
On 02/27/07 08:25, Etienne Robillard wrote:
> Had this problem for a while.. It seems
> to have disappear when booting with acpi enabled??

Oh - jsut realized it wasn't loaded (etherbooting doesn't load the 
modules, and I've been spoiled by having it autoload).  Adding to my 
kernel now.

> Dunno what may cause your bug, however I still gets
> some of this:
> 
> calcru: runtime went backwards from 37004444177421276
> usec to 18502193351497934 usec for pid 81026 (zsh)
> 
> FreeBSD flick 7.0-CURRENT FreeBSD 7.0-CURRENT #13: Mon
> Jan 29 14:05:04 EST 2007    
> root_at_flick:/usr/src/sys/i386/compile/CURRENT  i386
> 
> 
> Are both bugs described correlated? 

I don't know for sure.  Seems that slamming the CPU to 100% busy makes 
the messages occur much less.

Yikes!  Look at this:

# vmstat -i
interrupt                          total       rate
irq0: clk                        8299985        116
irq1: atkbd0                          67          0
irq4: sio0                          5325          0
irq8: rtc                        1065804         14
irq11: re0                         73060          1
irq14: ata0                           15          0
irq15: ata1                           58          0
Total                            9444314        132

Maybe acpi will help that too.

Eric


> 
> TIA,
> Etienne
> 
> 
> --- Eric Anderson <anderson_at_freebsd.org> wrote:
> 
>> When I boot a -CURRENT box with boot verbose enabled
>> inside qemu, I see
>> one of these messages about every second:
>>
>> 15.f68c5ee76faebe10 too short
>> 16.0f822e13092c5580 too long
>>
>> I can obviously whack the printf's, but what's the
>> 'right way' to fix
>> this?  Set HZ to something? Pick a different timer?
>>
>> kern.timecounter.tick: 1
>> kern.timecounter.choice: TSC(800) i8254(0)
>> dummy(-1000000)
>> kern.timecounter.hardware: TSC
>> kern.timecounter.nsetclock: 2
>> kern.timecounter.ngetmicrotime: 80036
>> kern.timecounter.ngetnanotime: 0
>> kern.timecounter.ngetbintime: 0
>> kern.timecounter.ngetmicrouptime: 29057
>> kern.timecounter.ngetnanouptime: 109
>> kern.timecounter.ngetbinuptime: 488
>> kern.timecounter.nmicrotime: 1708
>> kern.timecounter.nnanotime: 11
>> kern.timecounter.nbintime: 1719
>> kern.timecounter.nmicrouptime: 687
>> kern.timecounter.nnanouptime: 0
>> kern.timecounter.nbinuptime: 3734
>> kern.timecounter.stepwarnings: 0
>> kern.timecounter.tc.i8254.mask: 4294967295
>> kern.timecounter.tc.i8254.counter: 7769
>> kern.timecounter.tc.i8254.frequency: 1193182
>> kern.timecounter.tc.i8254.quality: 0
>> kern.timecounter.tc.TSC.mask: 4294967295
>> kern.timecounter.tc.TSC.counter: 809045640
>> kern.timecounter.tc.TSC.frequency: 1995115260
>> kern.timecounter.tc.TSC.quality: 800
>> kern.timecounter.smp_tsc: 0
>>
>> FreeBSD  7.0-CURRENT FreeBSD 7.0-CURRENT #3: Fri Feb
>> 23 09:28:20 CST
>> 2007 i386
>>
>> Eric
>>
>>
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> 
> 
> ----
> Etienne Robillard
> 7680 de jouvence, La Plaine
> J7M-2K9, Québec
> Telephone: 450-478-5026
> Yahoo Messenger ID: granted14
> Skype ID: incidah
> 
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Received on Tue Feb 27 2007 - 15:10:27 UTC

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