svn commit: r212541 - in head/sys: amd64/amd64 amd64/include
dev/acpica i386/i386 i386/include kern mips/include mips/mips
pc98/pc98 powerpc/aim powerpc/booke powerpc/include
Daan at vehosting.nl
Sat Sep 18 14:39:11 UTC 2010
On Saturday 18 September 2010 15:48:12 Alexander Motin wrote:
> Daan Vreeken wrote:
> > On Monday 13 September 2010 09:25:35 Alexander Motin wrote:
> >> Author: mav
> >> Date: Mon Sep 13 07:25:35 2010
> >> New Revision: 212541
> >> URL: http://svn.freebsd.org/changeset/base/212541
> >> Log:
> >> Refactor timer management code with priority to one-shot operation
> >> mode. The main goal of this is to generate timer interrupts only when
> >> there is some work to do. When CPU is busy interrupts are generating at
> >> full rate of hz + stathz to fullfill scheduler and timekeeping
> >> requirements. But when CPU is idle, only minimum set of interrupts (down
> >> to 8 interrupts per second per CPU now), needed to handle scheduled
> >> callouts is executed. This allows significantly increase idle CPU sleep
> >> time, increasing effect of static power-saving technologies. Also it
> >> should reduce host CPU load on virtualized systems, when guest system is
> >> idle.
> > [snip]
> > When re-basing an ARM system running an older -current with local
> > patches/additions to a more recent version of -current (around
> > 2010-09-16-ish) I found out that the resulting kernel stopped booting.
> > To factor out our local changes I've tried to boot a 'SHEEVAPLUG' kernel
> > without modifications. This kernel also fails to boot. It just stops
> > right after :
> > Can you perhaps tell me what's going wrong after this commit?
> > (If you need more info, I'd be happy to provide it where I can.)
> Sorry. Timer interrupt loss in one-shot mode made timer to not reload.
> r212823 fixes this problem for me.
Yes, that fixed it. Thanks for the quick fix!
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