Intermittent connectivity loss with em(4)

[Morgan Wesström]

> I just tried the same thing using 12.0-RELEASE-p9.  No drops.
> 
> mail# ping -i 60 8.8.8.8
> PING 8.8.8.8 (8.8.8.8): 56 data bytes
> 64 bytes from 8.8.8.8: icmp_seq=0 ttl=54 time=10.528 ms
> 64 bytes from 8.8.8.8: icmp_seq=1 ttl=54 time=11.403 ms
> 64 bytes from 8.8.8.8: icmp_seq=2 ttl=54 time=10.351 ms
> 64 bytes from 8.8.8.8: icmp_seq=3 ttl=54 time=10.787 ms
> 64 bytes from 8.8.8.8: icmp_seq=4 ttl=54 time=12.280 ms
> 64 bytes from 8.8.8.8: icmp_seq=5 ttl=54 time=10.038 ms
> 64 bytes from 8.8.8.8: icmp_seq=6 ttl=54 time=10.640 ms
> 64 bytes from 8.8.8.8: icmp_seq=7 ttl=54 time=11.090 ms
> 64 bytes from 8.8.8.8: icmp_seq=8 ttl=54 time=10.615 ms
> 64 bytes from 8.8.8.8: icmp_seq=9 ttl=54 time=8.972 ms
> 64 bytes from 8.8.8.8: icmp_seq=10 ttl=54 time=10.016 ms
> 64 bytes from 8.8.8.8: icmp_seq=11 ttl=54 time=11.097 ms
> 64 bytes from 8.8.8.8: icmp_seq=12 ttl=54 time=13.035 ms
> 64 bytes from 8.8.8.8: icmp_seq=13 ttl=54 time=11.251 ms
> 64 bytes from 8.8.8.8: icmp_seq=14 ttl=54 time=9.588 ms
> 64 bytes from 8.8.8.8: icmp_seq=15 ttl=54 time=10.649 ms
> 64 bytes from 8.8.8.8: icmp_seq=16 ttl=54 time=9.965 ms
> 64 bytes from 8.8.8.8: icmp_seq=17 ttl=54 time=9.900 ms
> 64 bytes from 8.8.8.8: icmp_seq=18 ttl=54 time=11.253 ms
> 64 bytes from 8.8.8.8: icmp_seq=19 ttl=54 time=9.440 ms
> 64 bytes from 8.8.8.8: icmp_seq=20 ttl=54 time=11.544 ms
> 64 bytes from 8.8.8.8: icmp_seq=21 ttl=54 time=11.068 ms
> 64 bytes from 8.8.8.8: icmp_seq=22 ttl=54 time=10.196 ms
> 64 bytes from 8.8.8.8: icmp_seq=23 ttl=54 time=12.446 ms
> 64 bytes from 8.8.8.8: icmp_seq=24 ttl=54 time=10.467 ms
> 64 bytes from 8.8.8.8: icmp_seq=25 ttl=54 time=11.100 ms
> 64 bytes from 8.8.8.8: icmp_seq=26 ttl=54 time=9.746 ms
> 64 bytes from 8.8.8.8: icmp_seq=27 ttl=54 time=10.627 ms
> 64 bytes from 8.8.8.8: icmp_seq=28 ttl=54 time=10.339 ms
> 64 bytes from 8.8.8.8: icmp_seq=29 ttl=54 time=10.166 ms
> 64 bytes from 8.8.8.8: icmp_seq=30 ttl=54 time=10.055 ms
> 64 bytes from 8.8.8.8: icmp_seq=31 ttl=54 time=9.303 ms
> 64 bytes from 8.8.8.8: icmp_seq=32 ttl=54 time=11.240 ms
> 64 bytes from 8.8.8.8: icmp_seq=33 ttl=54 time=11.407 ms
> 64 bytes from 8.8.8.8: icmp_seq=34 ttl=54 time=10.930 ms
> 64 bytes from 8.8.8.8: icmp_seq=35 ttl=54 time=10.166 ms
> 64 bytes from 8.8.8.8: icmp_seq=36 ttl=54 time=11.400 ms
> 64 bytes from 8.8.8.8: icmp_seq=37 ttl=54 time=10.946 ms
> ^C
> --- 8.8.8.8 ping statistics ---
> 38 packets transmitted, 38 packets received, 0.0% packet loss
> round-trip min/avg/max/stddev = 8.972/10.685/13.035/0.846 ms
> 

Thank you, Doug. My original post may not have been clear enough but my 
pings are once per minute in my list. So connectivity comes and goes 
over periods of ~5 minutes. Your ping list seems to be a standard once 
per second ping so it only covers less than a minute.

Out of curiosity, what chip is used on your Intel NIC?

My original question of how to debug this issue remains.

/Morgan