[j-nsp] Slow RE path 20 x faster then PFE path

[Robert Raszuk]

Hi,

Would anyone have any idea why IP packets with options are forwarded via
MX104 20x faster then regular IP packets ?

"fast" PFE path - 24-35 ms
"slow" RE path - 1-4 ms

Example (I used record route to force IP Options punt to slow path):

rraszuk at cto-lon2:~$ ping 62.189.71.209 -R -v
PING 62.189.71.209 (62.189.71.209) 56(124) bytes of data.
64 bytes from 62.189.71.209: icmp_seq=1 ttl=63 time=1.44 ms
RR:  69.191.176.206
        10.249.23.7
        62.189.71.209
        10.249.23.7
        69.191.176.206

64 bytes from 62.189.71.209: icmp_seq=2 ttl=63 time=1.38 ms
64 bytes from 62.189.71.209: icmp_seq=3 ttl=63 time=1.46 ms
64 bytes from 62.189.71.209: icmp_seq=4 ttl=63 time=1.41 ms
64 bytes from 62.189.71.209: icmp_seq=5 ttl=63 time=1.49 ms
64 bytes from 62.189.71.209: icmp_seq=6 ttl=63 time=1.46 ms
64 bytes from 62.189.71.209: icmp_seq=8 ttl=63 time=1.52 ms
64 bytes from 62.189.71.209: icmp_seq=9 ttl=63 time=2.84 ms
64 bytes from 62.189.71.209: icmp_seq=10 ttl=63 time=1.77 ms
^C
--- 62.189.71.209 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9014ms
rtt min/avg/max/mdev = 1.386/1.892/4.117/0.849 ms

Now I use normal ping running between  62.189.71.209 & 69.191.176.206  in
"fast" path:

rraszuk at cto-lon2:~$ ping 62.189.71.209 -v
PING 62.189.71.209 (62.189.71.209) 56(84) bytes of data.
64 bytes from 62.189.71.209: icmp_seq=1 ttl=63 time=24.1 ms
64 bytes from 62.189.71.209: icmp_seq=2 ttl=63 time=31.5 ms
64 bytes from 62.189.71.209: icmp_seq=3 ttl=63 time=24.1 ms
64 bytes from 62.189.71.209: icmp_seq=4 ttl=63 time=24.1 ms
64 bytes from 62.189.71.209: icmp_seq=5 ttl=63 time=24.0 ms
64 bytes from 62.189.71.209: icmp_seq=6 ttl=63 time=24.1 ms
^C
--- 62.189.71.209 ping statistics ---
6 packets transmitted, 6 received, 0% packet loss, time 5006ms
rtt min/avg/max/mdev = 24.097/25.369/31.563/2.774 ms
rraszuk at cto-lon2:~$

Best,
R.