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 ? >
Exactly. Jan
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