On Tue, 12 Oct 2010, Wolfgang Grandegger wrote: > Yes, packet losses can also happen, when the message buffers are not > read out fast enough. But then you should see overrun errors, which you > should see with "candump any,0:0,#FFFFFFFF". See also: > > http://lxr.linux.no/#linux+v2.6.35.7/drivers/net/can/mscan/mscan.c#L353
Right. > Also "# ip -d -s link show can0" should list them. > > > We were able to avoid losing messages by reading them in hard-irq > > context (with lincan driver), but I'm not sure whether this will help if > > you use CF (we do not use it). > > Well, if the CF card driver is causing huge latencies, it should be > fixed. It should not be too difficult to spot the latency evil with ftrace. I've heard that one company that experienced these problems tried to solve it with Thomas Gleixner and he said that it is impossible to fix. But that's only what I've heard, I do not know any details. -Michal _______________________________________________ Socketcan-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/socketcan-users
