High interrupts?

maverick_slo

Hi all!

I configured latest release 2.0.1 pfsense.
For 2 days it was working just fine, now all of the sudden I have very high interrupts.
From 34-60%…

vmstat -i shows:

interrupt                          total       rate
irq4: uart0                      7361324      24702
irq16: fxp0 fxp1                    3558         11
irq17: fxp2 fxp3                    3287         11
irq20: atapci0                      3249         10
irq21: uhci0 uhci1*                   23          0
cpu0: timer                       593503       1991
Total                            7964944      26728

Is uart0 the problem here?
This is serial output right?

There is almost no traffic on firewall…
Maybe 10-40 Kbps...

It was all working fine for 2 days... Today in the morning bam, interrupts were sky high....

Any idea what should I do?

Thanks!

wallabybob

24k interrupts per second is a high rate, especially for a serial port. Maybe you can disable the COM ports in the BIOS. Does the COM port have a cable connected? Maybe the cable is picking up noise on the UART Rx line and that is causing interrupts.

Maybe you could set the UART speed to a much lower value and that should correspondingly reduce the interrupt rate.

maverick_slo

Hi!

Thanks for suggestion.

I only have:

1. VGA cable connected
2. 3x LAN conncted (2nics in lagg0 for LAN, one nic for other network)
3. 1x WAN connected
4. USB keyboard

I`m looking at this from remote location…
Console is not connected...

wallabybob

What does @maverick_slo:

Console is not connected…

mean? You are using a serial port as the system console but it is not connected?

Please provide output of pfSense shell command```
sysctl kern.tty_nout; sleep 60; sysctl kern.tty_nout
sysctl kern.tty_nin ; sleep 60; sysctl kern.tty_nin


Does the pfSense _top_ command show a high percentage of time in interrupts?

maverick_slo

Huh…

I use VGA and keyboard :)
I should disable Serial port probably since I do not use it...


Out:
kern.tty_nout: 721880
kern.tty_nout: 721903

and in:

kern.tty_nin: 459
kern.tty_nin: 459

last pid: 41605;  load averages:  0.78,  0.99,  0.93     up 0+03:04:59  13:49:14
42 processes:  1 running, 41 sleeping
CPU:  0.4% user,  0.0% nice,  0.4% system, 58.0% interrupt, 41.3% idle
Mem: 41M Active, 17M Inact, 42M Wired, 968K Cache, 25M Buf, 866M Free
Swap: 8192M Total, 8192M Free

wallabybob

@maverick_slo:


Out:
kern.tty_nout: 721880
kern.tty_nout: 721903

and in:

kern.tty_nin: 459
kern.tty_nin: 459

Lots of uart interrupts that aren't accompanied by tty input characters or output characters uggests to me a noisy uart Rx line.

@maverick_slo:

I should disable Serial port probably since I do not use it…

I think so.

maverick_slo

So basically this should resolve this issue right?

But still… Console port is not plugged anywhere... Strange that this started to happen today...

maverick_slo

Yeah, I disabled console and all com ports, now it`s working great…

Thanks for support!