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. Though versions do not have an influence here, reporting them is considered useful anyway (RTnet release/trunk, Xenomai version, kernel version - and your architecture!). I will have a look at the natsemi code. I don't have hardware to test unfortunately. Could you check your setup over a different NIC type? Jan
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