Am 28.10.2010 09:34, Anders Blomdell wrote: > Anders Blomdell wrote: >> Anders Blomdell wrote: >>> Hi, >>> >>> I'm trying to use rt_eepro100, for sending raw ethernet packets, but I'm >>> experincing occasionally weird behaviour. >>> >>> Versions of things: >>> >>> linux-2.6.34.5 >>> xenomai-2.5.5.2 >>> rtnet-39f7fcf >>> >>> The testprogram runs on two computers with "Intel Corporation >>> 82557/8/9/0/1 Ethernet Pro 100 (rev 08)" controller, where one computer >>> acts as a mirror sending back packets received from the ethernet (only >>> those two computers on the network), and the other sends packets and >>> measures roundtrip time. Most packets comes back in approximately 100 >>> us, but occasionally the reception times out (once in about 100000 >>> packets or more), but the packets gets immediately received when >>> reception is retried, which might indicate a race between rt_dev_recvmsg >>> and interrupt, but I might miss something obvious. >> >> Changing one of the ethernet cards to a "Intel Corporation 82541PI >> Gigabit Ethernet Controller (rev 05)", while keeping everything else >> constant, changes behavior somewhat; after receiving a few 100000 >> packets, reception stops entirely (-EAGAIN is returned), while >> transmission proceeds as it should (and mirror returns packets). >> >> Any suggestions on what to try? > > Since the problem disappears with 'maxcpus=1', I suspect I have a SMP > issue (machine is a Core2 Quad), so I'll move to xenomai-core. > (original message can be found at > http://sourceforge.net/mailarchive/message.php?msg_name=4CC82C8D.3080808%40control.lth.se > > ) > > Xenomai-core gurus: which is the corrrect way to debug SMP issues? > Can I run I-pipe-tracer and expect to be able save at least 150 us of > traces for all cpus? Any hints/suggestions/insigths are welcome...
The i-pipe tracer unfortunately only saves traces for a the CPU that triggered the freeze. To have a full pictures, you may want to try my ftrace port I posted recently for 2.6.35. Jan
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