VLAN trunking and fragmentation

[Giulio Ferro]

Pyun YongHyeon wrote:
>  > 
>  > # ping -s 2000 192.168.100.2
>  > PING 192.168.100.2 (192.168.100.2): 2000 data bytes
>  > 2008 bytes from 192.168.100.2: icmp_seq=0 ttl=64 time=0.264 ms
>  > 2008 bytes from 192.168.100.2: icmp_seq=1 ttl=64 time=1001.186 ms
>
> [...]
>
>  > 2008 bytes from 192.168.100.2: icmp_seq=41 ttl=64 time=0.181 ms
>  > 
>  > 
>  > 
>  > It would be great if you could understand why this happens...
>  > 
>
> Try set tunable hw.re.msi_disable and let me know how it goes.
> (Add hw.re.msi_disable="1" to /boot/loader.conf)
>
>   
You're spot on!

----------------------------------
# ping -c 200 -s 1472 192.168.100.2
PING 192.168.100.2 (192.168.100.2): 1472 data bytes
1480 bytes from 192.168.100.2: icmp_seq=0 ttl=64 time=0.192 ms
1480 bytes from 192.168.100.2: icmp_seq=1 ttl=64 time=0.151 ms
1480 bytes from 192.168.100.2: icmp_seq=2 ttl=64 time=0.155 ms
1480 bytes from 192.168.100.2: icmp_seq=3 ttl=64 time=0.150 ms
1480 bytes from 192.168.100.2: icmp_seq=4 ttl=64 time=0.151 ms
1480 bytes from 192.168.100.2: icmp_seq=5 ttl=64 time=0.149 ms
1480 bytes from 192.168.100.2: icmp_seq=6 ttl=64 time=0.153 ms
1480 bytes from 192.168.100.2: icmp_seq=7 ttl=64 time=0.149 ms
[...]
--- 192.168.100.2 ping statistics ---
200 packets transmitted, 200 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.148/0.159/1.472/0.093 ms
----------------------------------

What does that tunable do?