Jan Kiszka wrote: > Am 28.10.2010 11:34, Anders Blomdell wrote: >> Jan Kiszka wrote: >>> 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. >> 2.6.35.7 ? Well, 2.6.35.7/xenomai/rtnet without ftrace patch freezes after approx 8000 rounds (16000 packets). Time freshen up find serial port console debugging I guess (under the assumption that this is the same bug, but easier to reproduce).
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