Avoid LCR-Stalling

Konrad Meier meierk at informatik.uni-freiburg.de
Wed Aug 11 16:34:02 UTC 2010

Hi Andreas,

I have Ubuntu 10.4 running on an Core 2 Duo machine with SATA-Harddisk. 
The LCR stalling is definatly not a problem of a insufficient CPU power. 
But every time a stalling message apears i can see heavy harddisk access.


Am 11.08.2010 09:08, schrieb Andreas.Eversberg:
> hi,
> what machine do you use? it smells like IDE harddisk. i also have IDE on a test system. better get rid of it.
> regards,
> andreas
> -----Ursprüngliche Nachricht-----
> Von: openbsc-bounces at lists.gnumonks.org [mailto:openbsc-bounces at lists.gnumonks.org] Im Auftrag von Konrad Meier
> Gesendet: Dienstag, 10. August 2010 15:56
> An: OpenBSC list
> Betreff: Avoid LCR-Stalling
> Dear List,
> At the moment I am building a GSM-Network with OpenBSC and three NanoBTS
> at the University of Freiburg. The purpose of this network is teaching
> and research. The Network has an ISDN BRI Interface which allows every
> gsm-phone to be called over a land line telephony number.
> We had huge problems with LCR-Stalling in our setup which lead to a
> increasing delay during a call (up to 6-10 seconds...). We could trace
> the problem to lookups in the database hlr.sqlite3. After some time the
> database was about 18MB big and it took some time to perform operations
> in the database.
> The quick solution was to copy the database to a RAM-Disk. A RAM-Disk
> can be created like this:
>    sudo mount -t tmpfs -o size=300M tmpfs ramdisk
> After that, we never had seen stalling anymore.
> But this can only be considered as a quick hack because in case of a
> system failure all changes to the database are lost.
> Is someone at the moment working on a interface to a better database
> system? Maybe I find some student who can do this.
> Regards
>    Konrad Meier

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