Re: [Xenomai-core] [RTnet-users] Potential problem with rt_eepro100
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 10 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 10 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... Regards Anders Blomdell ___ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
Re: [Xenomai-core] [RTnet-users] Potential problem with rt_eepro100
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 10 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 10 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 signature.asc Description: OpenPGP digital signature ___ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
Re: [Xenomai-core] [RTnet-users] Potential problem with rt_eepro100
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 10 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 10 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 ? /Anders ___ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
Re: [Xenomai-core] [RTnet-users] Potential problem with rt_eepro100
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 10 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 10 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 signature.asc Description: OpenPGP digital signature ___ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
