I'm vaguely wondering whether the scheduling of kernel task (like the
scsi completion thread) is interfering with clock updates.


On Wed, 28 May 2003, Thor Lancelot Simon wrote:

> On Wed, May 28, 2003 at 10:23:52AM +0100, Julian Coleman wrote:
> > > Now I'm sitting at home with a cheezy 5MB/sec SCSI DLT 2500 on
> > > an ancient bha host adapter, trying to restore a tape of some
> > > music files.  I'm noticing not only time slip but a steady stream
> > > of "ohci0: one scheduling overruns".
> >
> > Is this on alpha?  I tried burning on CD on my PC164 the other week and,
> > while it was doing it, saw hundreds of messages along the lines of:
> >
> >   ohci0: 14 scheduling overruns
> >   ohci1: 15 scheduling overruns
> >   ohci0: 11 scheduling overruns
> >   ohci1: 13 scheduling overruns
> >
> > The CDR is on the IDE bus:
>
> No, this is a SCSI tape on a BusLogic parallel-SCSI host adapter on an
> i386, a Tyan Tiger MP with a 1.3GHz Athlon XP to be precise.  It's
> interesting that you're seeing a similar symptom with a scsipi device
> attached to an ATAPI bus, though.
>
> Thor
>