> I got frusted a bit by this problem (smsd using incredible much cpu > even when idle) so I ran smsd through valgrind (well, callgrind). > It looks like tons of time is spend in an usleep(100); (yes, hundred). > I always thought that Linux would just round it up to the next > scheduling interval but it looks like that is a busy loop these days? > I changed it from 100us to 10ms and now the cpu usage dropped from on > average > 8% to < 1%. And that is on a "Intel(R) Core(TM) i7-3930K CPU > @ 3.20GHz". > Really something that communicates with a device at 19.2kBps should > not use that much cpu. > So please apply. > Thanks. > Oh and I think there maybe other possibilities of optimizing smsd left. > > > > Regards, > > > Folkert van Heusden > > www.smartwinning.info
This fix is applied in the version >= 3.1.16 (upstream). Regards, Keke
