Meaning of LOST message

Harald Welte laforge at
Tue May 31 06:44:02 UTC 2011


On Mon, May 30, 2011 at 11:41:58PM +0200, Drasko DRASKOVIC wrote:

> LOST 3054!
> What would this LOST 3054! say ? It does not sound good anyway, but at
> this point I am not skilled enough to read OsmocomBB logs.

This is the output of some code I wrote a while ago in order to detect
when our CPU is too busy in the GSM L1 and thus looses one interrupt.
When we enter the L1S (synchronouos part of L1) in FIQ mode, further
FIQs are disabled and remain disabled until L1S returns from FIQ.

If the overall time takes longer than the 4000 quarter-bit-clocks
between two TDMA interrupts, then we print that LOST message.

However, the LOST detection logic is not 100% perfect, either.  So if
you see the occasional message here and there it is fine.  If you see a
sequence of them, I would say it is an indication of a problem.

- Harald Welte <laforge at> 
"Privacy in residential applications is a desirable marketing option."
                                                  (ETSI EN 300 175-7 Ch. A6)

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