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-
>>>>>>   xenomai-
>>>>>>   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.
>> ?
Well, 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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