[mc1322x] 6LowPAN data payload

[Mariano Alvira]

On Wed, Jul 14, 2010 at 03:12:00PM -0400, Mariano Alvira wrote:
> 
> ping6 -i .34 -s 1200 aaaa::250:c2ff:fea8:c3e2

This is a waveform of a 1200 byte ping.

The yellow trace is the border router TX. The blue is the client
TX. The purple is the border router's UART.

The timing on this is:

border-tx:        56ms
client-tx:        56ms
border overhead: 136ms
slip-tx:         108ms  (115200 bps)

Running the UART faster is going to be the next best way to get ping
times down.

Also here are the results of ping flood tests:

sudo ping6 -c 1000 -f -s 1 aaaa::250:c2ff:fea8:c3e2
PING aaaa::250:c2ff:fea8:c3e2(aaaa::250:c2ff:fea8:c3e2) 1 data bytes
--- aaaa::250:c2ff:fea8:c3e2 ping statistics ---
1000 packets transmitted, 846 received, 15% packet loss, time 14934ms
, pipe 4, ipg/ewma 14.949/0.000 ms

sudo ping6 -c 1000 -f -s 16 aaaa::250:c2ff:fea8:c3e2
PING aaaa::250:c2ff:fea8:c3e2(aaaa::250:c2ff:fea8:c3e2) 16 data bytes
--- aaaa::250:c2ff:fea8:c3e2 ping statistics ---
1000 packets transmitted, 591 received, 40% packet loss, time 14293ms

sudo ping6 -c 1000 -f -s 32 aaaa::250:c2ff:fea8:c3e2
PING aaaa::250:c2ff:fea8:c3e2(aaaa::250:c2ff:fea8:c3e2) 32 data bytes
--- aaaa::250:c2ff:fea8:c3e2 ping statistics ---
1000 packets transmitted, 472 received, 52% packet loss, time 13803ms
rtt min/avg/max/mdev = 22.410/27.003/45.930/4.606 ms, pipe 4, ipg/ewma
13.817/28.847 ms

sudo ping6 -c 1000 -f -s 64 aaaa::250:c2ff:fea8:c3e2
PING aaaa::250:c2ff:fea8:c3e2(aaaa::250:c2ff:fea8:c3e2) 64 data bytes
--- aaaa::250:c2ff:fea8:c3e2 ping statistics ---
1000 packets transmitted, 352 received, 64% packet loss, time 14167ms
rtt min/avg/max/mdev = 29.847/33.708/52.006/3.035 ms, pipe 5, ipg/ewma
14.182/32.427 ms

sudo ping6 -c 1000 -f -s 86 aaaa::250:c2ff:fea8:c3e2
PING aaaa::250:c2ff:fea8:c3e2(aaaa::250:c2ff:fea8:c3e2) 86 data bytes
--- aaaa::250:c2ff:fea8:c3e2 ping statistics ---
1000 packets transmitted, 376 received, 62% packet loss, time 13027ms
rtt min/avg/max/mdev = 35.296/42.018/60.105/6.141 ms, pipe 6, ipg/ewma
13.040/42.013 ms

-Mar.
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