Il Thu, Oct 04, 2007 at 01:32:44AM +0200, Frans Pop ha scritto:
> On Wednesday 03 October 2007, you wrote:
> > On Wed, Oct 03, 2007 at 09:27:41PM +0200, Frans Pop wrote:
> > > On Wednesday 03 October 2007, you wrote:
> > > > On Wed, 3 Oct 2007, Ilpo Järvinen wrote:
> > > > > On Wed, 3 Oct 2007, Frans Pop wrote:
> > > > > > The only change is in 2 consecutive columns: "2911 502" -> "2912
> > > > > > 500". Is processor usage calculated from those? Can someone
> > > > > > explain how?
> > > > >
> > > > > The latter seems to be utime ...decreasing. No wonder if
> > > > > arithmetics will give strange results (probably top is using
> > > > > unsigned delta?)...
> > > >
> > > > Hmm, minor miscounting from my side, stime seems more appropriate...
> > >
> > > So, is it normal that stime decreases sometimes or a kernel bug?
> > > /me expects the last...
> >
> > Let me guess... Dual core AMD64 ?
>
> Nope: Intel(R) Pentium(R) D CPU 3.20GHz
I just notice the same thing here, with a Core2 Duo (which is supposed
to have synced TSCs) and working HPET.
> The following may well be relevant.
> With 2.6.22 and early 2.6.23-rc kernels (rc3-rc6) I often had this in my
> kernel log (see http://lkml.org/lkml/2007/9/16/45):
> checking TSC synchronization [CPU#0 -> CPU#1]:
> Measured 248 cycles TSC warp between CPUs, turning off TSC clock.
> Marking TSC unstable due to check_tsc_sync_source failed
I don't see this though, TSCs are always syncronized between the 2
cores.
Luca
--
Ligabue canta: "Tutti vogliono viaggiare in primaaaa..."
Io ci ho provato e dopo un chilometro ho fuso il motore e bruciato
la frizione...
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