[hsflinux] Lockups with hsfmodem_7.18.00full on 2.4.18

Thomas White taw27 at cam.ac.uk
Fri Dec 17 20:50:40 EST 2004

Thomas White <taw27 at cam.ac.uk> wrote:

> "Linuxant support (Jonathan)" <support at linuxant.com> wrote:
> > did you try using an unpatched or official Debian kernel? It is
> > possible that the low-latency and/or preempt patches you applied to
> > the kernel may be causing the lockups.
> I suspected one of those might be causing the problem.  I'll do some
> experimenting and get back to you in the next few days.

Actually, I've side-stepped the whole issue by moving to a 2.6.9 kernel.
 This is an unpatched vanilla (kernel.org) kernel.  Unfortunately, I
seem to be finding similar problems. Just now, when trying to reconnect
the modem after an unexpected disconnection, the system didn't quite
lock up but became very unresponsive with the proces"khsfd/modem"(nice
value-20) running with 100% CPU usage.  My system log contains the
following cryptic message for that moment:

Dec 17 20:29:12 taw27 kernel: 0020270.084: <7>^^^^^ SPIKE_NOT_FOUND
^^^^^^ LoopBackSpikeThreshold=-7000

Before changing kernel, I also noticed one lockup with the 2.4.18 kernel
without the low-latency patch (but still with the preempt patch).

I'll try 2.6.9 with preempt turned off over the next few days, but
hopefully that information might be of use in the meantime.



Thomas White
Downing College

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