ifpps: stats_diff error

[jonschipp]

Ifpps throws an error after a few lines when I use a 10 second interval.
ifpps --dev eth2 --csv --loop --interval 10000

ifpps: ifpps.c:539: stats_diff: Assertion `!((new->rx_bytes - old->rx_bytes) > (new->rx_bytes))' failed.

[jonschipp]

Actually, it's happening at other times too e.g. ifpps --dev eth2

ifpps: ifpps.c:563: stats_diff: Assertion `!((new->irqs[i] - old->irqs[i]) > (new->irqs[i]))' failed

[jonschipp]

Ah, sorry, false alarm. I had a script bringing down the interface I forgot was running, at specific times. That was the cause.

[tklauser]

Thanks for reporting this. Still, I think the bug_on() wouldn't be necessary in this case. We might be able to just reset the stats if the interface went down inbetween. I'll have a look...

[borkmann]

Sounds good, bringing the interface down should not bring down ifpps. ;-) I think something like resetting the stats sounds like a good idea.

[tklauser]

@jonschipp: Could you check whether the above commit fixes the issue for you? Thanks!

[borkmann]

Thanks Tobias!

[jonschipp]

Yes, thanks, I should now be able to avoid using "watch -n 1 'cat /proc/net/dev | column -t'.