Jan Kiszka wrote: > Lauener Nathan wrote: >> Our adminstrators have obviously changed our email address. Here is the >> posting once more, from a new address. Sorry, if anyone should receive >> it twice. >> >> --------- >> >> Hi, >> >> after switching to a new linux box I now have high latency on >> rt_dev_recvmsg(). Instead of approximately 20us I now measure up to 1ms! >> I use the same network card which uses the rt_natsemi driver. The >> software is the same, only compiled it on the new box. The >> Ethernet-package sent by the controller is immediately sent back by the >> receiver. The response time according to our network sniffer is about 10 >> us, so there should be something to read. Introducing a sleep of 100us >> before reading didn't help. I also have debug symbols in the kernel log, >> looks like a trace. Maybe the logging causes the latency, but I could >> not turn the logging off, no matter what options or versions of the >> kernel, xenomai or rtnet that I tried. Here is a short printout of the >> log. > > The latency might be related to the BUG printing. The BUG itself is > already a problem that demands to be looked at.
Looks like a bug of rt_natsemi (dma mapping of rx buffers with wrong size). Will come up with a patch soon. Jan
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