Re: Linux v2.6.16-rc5 - regression

From: Peter Hagervall
Date: Tue Feb 28 2006 - 06:39:17 EST


On Tue, Feb 28, 2006 at 02:03:36AM -0800, Andrew Morton wrote:
> Peter Hagervall <hager@xxxxxxxxx> wrote:
> >
> > In -rc5 the printk timing numbers do not reset to [ 0.000000] upon
> > boot.
>
> What numbers are you getting now?
>

[4294667.296000] and upwards.

> > This worked in -rc4 and so I started bisecting and git came up
> > with:
> >
> > commit 9827b781f20828e5ceb911b879f268f78fe90815
> > Author: Kurt Garloff <garloff@xxxxxxx>
> > Date: Mon Feb 20 18:27:51 2006 -0800
> >
> > [PATCH] OOM kill: children accounting
> >
> > I can't see why that would break the timing information, but I'll just
> > assume that git was right, and tell you guys.
>
> Well yes, it'll be something else - perhaps some TSC change or something.
> We'd need to know what architecture you're using...

sap ~ $ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 2
model name : Intel(R) Pentium(R) 4 CPU 2.00GHz
stepping : 4
cpu MHz : 1994.176
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm
bogomips : 3992.49

>
> Anwyay, these numbers aren't supposed to measure anything absolute like
> uptime - they're purely for relative timing. It would be nice to get them
> increasing monotonically from zero, but we wouldn't bust a gut to achieve
> that - it's just a debugging thing.

Yeah, it's not a showstopper or anything, just thought I'd pipe up.

Peter Hagervall

--
Peter Hagervall......................email: hager@xxxxxxxxx
Department of Computing Science........tel: +46(0)90 786 7018
University of Umeå, SE-901 87 Umeå.....fax: +46(0)90 786 6126
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