[arch-general] 11 minutes mode

[Uli Armbruster]

* Myra Nelson <myra.nelson at hughes.net> [31.07.2012 18:43]:
> On Tue, Jul 31, 2012 at 6:39 AM, Jorge Almeida <jjalmeida at gmail.com> wrote:
> > On Tue, Jul 31, 2012 at 12:16 PM, Tom Gundersen <teg at jklm.no> wrote:
> >> On Tue, Jul 31, 2012 at 1:09 PM, Jorge Almeida <jjalmeida at gmail.com> wrote:
> >>> Anybody knows how to make sure that the kernel will not mess with the hardware
> >>> clock every 11 minutes? The proper way would be to use a kernel that doesn't
> >>> try to do it, but I want to use Arch's standard kernel, which has
> >>> CONFIG_GENERIC_CMOS_UPDATE=y.
> >>> Maybe something in /proc?
> >>
> >> As far as I know the only thing that will trigger 11-minute-mode is
> >> that an ntp client tells the kernel that it is running.
> >>
> > I found in http://www.mail-archive.com/questions@lists.ntp.org/msg02172.html
> > that "echo 0 > /proc/sys/kernel/time/rtc_update" would do it, but we don't
> > have /proc/sys/kernel/time/. Maybe this info is outdated, or it requires the
> > PPSkit patch...
> >
> > Thanks
> >
> > J.A.
> 
> 
> This is interesting. My problem isn't every 11 minutes, it's spastic,
> and it started somewhere in the 3.3 to 3.4 range. I'll look up and my
> system time is off by a multiple of 11 minutes but sometimes up to an
> hour and half.
> 
> I've been working on the following assumptions:
> 
> The problem was a bad cmos battery and waiting to get one ordered
> Since it occurred more frequently coming out of suspension, it was
> something to do with my s2ram setup. This is why I (mistakenly) tried
> the uresume hook in my initramfs image.
> 
> The problem was based on hangs during rcu updates.
> I compiled a debugging kernel and seem to have a large number of them,
> and I was getting a lot of [ tsc clocksource unstable ]. Not yet sure
> if that's due to a buggy bios or a hardware problem.
> 
> Looks like I've got some more research todo.
> 
> Myra

I'm not entirely sure, but I sometimes have skips when playing a video or audio file with mplayer (although the system is idle, no heavy cpu usage) but not if playing an audio file with mpd. Could this be caused by this? I do have ntp running...