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intel-aero / meta-intel-aero

Yocto layer to support Intel Aero platform
https://github.com/intel-aero/meta-intel-aero
GNU General Public License v2.0
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intel-aero kernel serial8250: too much work for irq39 #397

Closed RohanKurane closed 5 years ago

RohanKurane commented 5 years ago

@lucasdemarchi @zehortigoza I noticed several folks including you have hit this issue.

In my case I am not doing anything with mavlink. I am running my application on the intel aero and see this message which I believe is causing failures in my application.

I have updated the intel aero to the latest all and Ubuntu 16.04 LTS.

What can I do here to avoid the message ?

lucasdemarchi commented 5 years ago

If you are not using mavlink, do you have anything using the uart? Is mavlink-router running?

RohanKurane commented 5 years ago

Here is the output from cat /proc/interrupts

39: 14356 167389 0 0 IO-APIC 39-fasteoi serial

Clearly there are a tons of interrupts going on for irq39.

What can I do here ? Can I clear those numbers for CPU0 and CPU1 ? Or do anything else ?

RohanKurane commented 5 years ago

@lucasdemarchi mavlink-router is running

rohan@intel-aero:~$ systemctl status mavlink-router ● mavlink-router.service - MAVLink Router Loaded: loaded (/lib/systemd/system/mavlink-router.service; enabled; vendor preset: enabled) Active: active (running) since Mon 2018-12-31 02:32:53 PST; 10min ago Process: 725 ExecStartPre=/bin/bash -c echo 4 > /sys/class/tty/ttyS1/rx_trig_bytes (code=exited, status=0/SUCCESS) Main PID: 806 (mavlink-routerd) CGroup: /system.slice/mavlink-router.service └─806 /usr/bin/mavlink-routerd

Dec 31 02:32:53 intel-aero systemd[1]: Started MAVLink Router. Dec 31 02:32:53 intel-aero mavlink-routerd[806]: Open UDP [4] 192.168.8.85:14550 Dec 31 02:32:53 intel-aero mavlink-routerd[806]: Open UDP [5] 192.168.7.255:14550 Dec 31 02:32:53 intel-aero mavlink-routerd[806]: Open UDP [6] 0.0.0.0:80550 Dec 31 02:32:53 intel-aero mavlink-routerd[806]: Open UART [7] /dev/ttyS1 Dec 31 02:32:53 intel-aero mavlink-routerd[806]: UART [7] speed = 921600 Dec 31 02:32:53 intel-aero mavlink-routerd[806]: Open TCP [9] 0.0.0.0:5760 * Dec 31 02:32:53 intel-aero mavlink-routerd[806]: Baudrate 921600 responded, keeping it Dec 31 02:32:53 intel-aero mavlink-routerd[806]: Logging target system_id=1 on 00023-2018-12-31_02-32-53.ulg Dec 31 02:32:58 intel-aero mavlink-routerd[806]: 4 messages to unknown endpoints in the last 5 seconds

RohanKurane commented 5 years ago

Do you recommend stopping the mavlink router here ? systemctl stop mavlink-router

RohanKurane commented 5 years ago

I stopped the mavlink-router and it did not help.

RohanKurane commented 5 years ago

I was able to get around the problem by changing some code in my application. But I do see these messages from time to time. Is there any way to mitigate this ?