Hi Jake and others.I'm sorry for the slow response time, but it's Christmas time and I have vacation. This also means I won't physically get to the computer until January, but it is still running with the faulty Gbit card (igb driver), so I can examine it remotely. Answers follow.
Dne 18. 12. 21 v 13:13 linuxptp-users-requ...@lists.sourceforge.net napsal(a):
Ok. So its based on the 4.9 kernel?
Yes.
The only other thing I might suggest is using ftrace to check whether igb_ptp_rx_rgtstamp and related functions are actually being called. This function is called in igb_process_skb_fields when a receive packet is detected as having a timestamp captured in the register.
Fortunately, the kernel has ftrace already enabled, so I did the test with the PTP client running. What's interesting is that ftrace doesn't report any calls of igb_process_skb_fields. It does also report no usages of igb_ptp_rx_tgtstamp. However, I saw this in the log:
kworker/4:0-9357 [004] ...1 471985.266393: igb_ptp_rx_hang <-igb_watchdog_task kworker/4:0-9357 [004] ...1 471985.266393: igb_rd32 <-igb_ptp_rx_hang
I'm not sure if it's helpful, but it's the only thing I got. Just to check, this is the way I'm reading the ftrace:echo function | sudo tee /sys/kernel/debug/tracing/current_tracer; for i in $(seq 1 10); do sudo cat /sys/kernel/debug/tracing/trace | grep -C3 igb_ptp; done; echo nop | sudo tee /sys/kernel/debug/tracing/current_tracer
In January, I'll be able to provide ftrace comparison with the working igb card.
Thanks for further guidance here. Martin -- Mgr. Martin Pecka, Ph.D. Researcher at Vision for Robotics and Autonomous Systems group Faculty of Electrical Engineering Czech Technical University in Prague Phone: +420 22435 7269
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