[Olsr-users] Fwd: Question about hidden node behavior

[Markus Kittenberger]

On Sat, Jan 15, 2011 at 4:06 PM, Juliusz Chroboczek <
(spam-protected)> wrote:

i just retestet with newer versions ath9k (openwrt trunk),.. (as
unfortunately last time i used a "release", and not trunk )-;)

and now ath9k did as well as ath5k!

so we "just" need to get rid of madwifi in our meshes, and QoS would be as
"easy" again as it used to be on WRT54GL & co *G

> q1  q2  q3 driver
> > 4.0 0.0 0.0 b43-legacy
> > 4.0 0.0 0.0 ath5k (pci)
>  > 2.5 1.5 0.0 ath9k (pci) old )-;
>
4.0 0.0 0.0 ath9k newer

> > 1.3 1.3 1.3 madwifi (ahb)
>
> Interesting.  What are the packet drop figures (ifconfig)?
>
i "never" saw ifconfig stating any dropped packets (at least on any openwrt
router)

but tc- s qdisc reports the drops,..

here the results for ath9k and ath5k

input:
100k packets in each of 3 udp-streams (via eth1)

wlan0 IEEE 802.11abgn ESSID:"test"
Mode:Ad-Hoc Frequency:2.412 GHz Cell: 12:34:56:78:90:AB
Tx-Power=3 dBm
RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off

wlan0 Link encap:Ethernet HWaddr 00:0C:42:61:05:21
inet addr:192.168.2.2 Bcast:192.168.2.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:18 errors:0 dropped:0 overruns:0 frame:0
TX packets:67135 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:756 (756.0 B) TX bytes:101346300 (96.6 MiB)

qdisc prio 1: dev wlan0 root refcnt 5 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
1 1 1 1 1
Sent 100161070 bytes 67135 pkt (dropped 227096, overlimits 0 requeues 32671)

rate 0bit 0pps backlog 0b 0p requeues 32671
qdisc sfq 10: dev wlan0 parent 1:1 limit 127p quantum 1514b perturb 10sec
Sent 98195980 bytes 65815 pkt (dropped 32261, overlimits 0 requeues 0)
rate 0bit 0pps backlog 0b 0p requeues 0
qdisc sfq 20: dev wlan0 parent 1:2 limit 127p quantum 1514b perturb 10sec
Sent 1160902 bytes 781 pkt (dropped 97310, overlimits 0 requeues 0)
rate 0bit 0pps backlog 0b 0p requeues 0
qdisc sfq 30: dev wlan0 parent 1:3 limit 127p quantum 1514b perturb 10sec
Sent 804188 bytes 539 pkt (dropped 97525, overlimits 0 requeues 0)
rate 0bit 0pps backlog 0b 0p requeues 0

ath5k

wlan0 IEEE 802.11abg ESSID:"test"
Mode:Ad-Hoc Frequency:2.412 GHz Cell: 12:34:56:78:90:AB
Tx-Power=3 dBm
RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off

wlan0 Link encap:Ethernet HWaddr 00:0C:42:2B:A4:E9
inet addr:192.168.2.2 Bcast:192.168.2.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:21 errors:0 dropped:0 overruns:0 frame:0
TX packets:73147 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:882 (882.0 B) TX bytes:110421520 (105.3 MiB)

qdisc prio 1: dev wlan0 root refcnt 5 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
1 1 1 1 1
Sent 109133874 bytes 73147 pkt (dropped 223235, overlimits 0 requeues 2674)
rate 0bit 0pps backlog 0b 0p requeues 2674
qdisc sfq 10: dev wlan0 parent 1:1 limit 127p quantum 1514b perturb 10sec
Sent 107133060 bytes 71805 pkt (dropped 26982, overlimits 0 requeues 0)
rate 0bit 0pps backlog 0b 0p requeues 0
qdisc sfq 20: dev wlan0 parent 1:2 limit 127p quantum 1514b perturb 10sec
Sent 1450266 bytes 973 pkt (dropped 97834, overlimits 0 requeues 0)
rate 0bit 0pps backlog 0b 0p requeues 0
qdisc sfq 30: dev wlan0 parent 1:3 limit 127p quantum 1514b perturb 10sec
Sent 550548 bytes 369 pkt (dropped 98419, overlimits 0 requeues 0)
rate 0bit 0pps backlog 0b 0p requeues 0

the reason why queue 20: and 30: manage to send more than 0pkt, ist that my
streams start/end not exactly simultaneously, and even if they would the
first 128 pkt aren`t dropped at the beginning,..

Markus

p.s. i seem to have ~ 2% packetloss on my ethernet interface *G


>
>                                        Juliusz
>
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