Lenovo X60 em

[Michael Widerkrantz]

Jon Otterholm <jon.otterholm at ide.resurscentrum.se> writes:

> I think I found a pattern to work with. If I do a echo-reply wit the
> "-D" (no fragment) and increase the packet size (-s) to 1472 I get
> normal response times:

I can verify that. I tried pinging the laptop from another machine
(10.0.0.2) in my small home LAN.

With large packets:

  tim# ping -D -s 1470 10.0.0.20
  PING brain.internal.hack.org (10.0.0.20): 1470 data bytes
  1478 bytes from 10.0.0.20: icmp_seq=0 ttl=64 time=1.278 ms
  1478 bytes from 10.0.0.20: icmp_seq=1 ttl=64 time=1.321 ms
  1478 bytes from 10.0.0.20: icmp_seq=2 ttl=64 time=1.235 ms
  1478 bytes from 10.0.0.20: icmp_seq=3 ttl=64 time=1.178 ms
  1478 bytes from 10.0.0.20: icmp_seq=4 ttl=64 time=1.096 ms
  1478 bytes from 10.0.0.20: icmp_seq=5 ttl=64 time=1.499 ms
  1478 bytes from 10.0.0.20: icmp_seq=6 ttl=64 time=1.451 ms
  1478 bytes from 10.0.0.20: icmp_seq=7 ttl=64 time=1.363 ms
  1478 bytes from 10.0.0.20: icmp_seq=8 ttl=64 time=1.280 ms
  ^C
  --- brain.internal.hack.org ping statistics ---
  9 packets transmitted, 9 packets received, 0% packet loss
  round-trip min/avg/max/stddev = 1.096/1.300/1.499/0.119 ms

With smaller packets:

  tim# ping -D -s 64 brain.internal
  PING brain.internal.hack.org (10.0.0.20): 64 data bytes
  72 bytes from 10.0.0.20: icmp_seq=0 ttl=64 time=0.450 ms
  72 bytes from 10.0.0.20: icmp_seq=1 ttl=64 time=53.031 ms
  72 bytes from 10.0.0.20: icmp_seq=2 ttl=64 time=48.112 ms
  72 bytes from 10.0.0.20: icmp_seq=3 ttl=64 time=43.394 ms
  72 bytes from 10.0.0.20: icmp_seq=4 ttl=64 time=38.311 ms
  72 bytes from 10.0.0.20: icmp_seq=5 ttl=64 time=33.252 ms
  72 bytes from 10.0.0.20: icmp_seq=6 ttl=64 time=28.313 ms
  72 bytes from 10.0.0.20: icmp_seq=7 ttl=64 time=23.204 ms
  72 bytes from 10.0.0.20: icmp_seq=8 ttl=64 time=18.531 ms
  ^C
  --- brain.internal.hack.org ping statistics ---
  9 packets transmitted, 9 packets received, 0% packet loss
  round-trip min/avg/max/stddev = 0.450/31.844/53.031/15.422 ms

Note what happens after the first packet.

The other way, /from/ the laptop, seems fine, though:

  brain# ping -D -s 64 tim.internal
  PING tim.internal.hack.org (10.0.0.2): 64 data bytes
  72 bytes from 10.0.0.2: icmp_seq=0 ttl=64 time=0.762 ms
  72 bytes from 10.0.0.2: icmp_seq=1 ttl=64 time=0.565 ms
  72 bytes from 10.0.0.2: icmp_seq=2 ttl=64 time=0.449 ms
  72 bytes from 10.0.0.2: icmp_seq=3 ttl=64 time=0.359 ms
  ^C
  --- tim.internal.hack.org ping statistics ---
  4 packets transmitted, 4 packets received, 0% packet loss
  round-trip min/avg/max/stddev = 0.359/0.534/0.762/0.151 ms