Timekeeping hosed by factor 3, high lapic[01] interrupt rates
John Baldwin
jhb at FreeBSD.org
Thu Jun 23 22:12:44 GMT 2005
On Thursday 23 June 2005 04:58 pm, Jens Schweikhardt wrote:
> John et al,
>
> On Wed, Jun 22, 2005 at 10:57:47AM -0400, John Baldwin wrote:
> # On Tuesday 21 June 2005 03:51 pm, Jens Schweikhardt wrote:
> # > John,
> # >
> # > # > See
> # > http://lists.freebsd.org/pipermail/freebsd-current/2005-May/050210.html
> # > # > for the whole thread.
> # > #
> # > # I did glance over it, but I don't really have time to read every
> e-mail # > on # current@ in detail. :( Do you have verbose dmesg's for
> both cases? # > If so, # can you get the 'lapic: Divisor' lines from each
> boot? # >
> # > Sure, they are the same:
> # > lapic: Divisor 2, Frequency 99829738 hz
> # >
> # > It appears Chris Gilbert has the same problem, see "Timekeeping gone
> # > whack in 6-CURRENT" on this list.
> #
> # Ok, this is weird. Does this happen if you disable SMP via
> # 'kern.smp.disabled=1' from the loader?
>
> No, with "set kern.smp.disabled=1" at the loader prompt,
> timekeeping is ok and vmstat -i displays
>
> interrupt total rate
> irq1: atkbd0 684 3
> irq13: npx0 1 0
> irq14: ata0 63 0
> irq15: ata1 109 0
> irq18: em0 27 0
> irq24: ahd0 23192 106
> irq25: ahc0 16 0
> lapic0: timer 430979 1986
> Total 455071 2097
>
> Regards,
>
> Jens
Ok. What timecounter does your UP kernel use, and does your UP kernel break
if you change the timecounter to i8254?
--
John Baldwin <jhb at FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve" = http://www.FreeBSD.org
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