[Click] Why roofnet can not work on high rates

[欧阳鑫]

 Hi, Robert.
       Thank you very much. I have resolved this problem. But now I find
when I run command "dmesg" there are some strange messages. As follows:

 .............
[615517.060230] ath: e9d3fec0
[615517.071710] ath: e9d3fe7c
[615517.680717] ath: e9d3fea0
[615517.680744] ath: e9d3fec8
[615517.692227] ath: e9d3fea8
[615517.692228] ath: e9d3fed0
[615517.703711] ath: e9d3fe8c
[615519.080722] ath: e9d3fe90
[615519.080750] ath: e9d3feb8
[615519.092228] ath: e9d3fe98
[615519.092230] ath: e9d3fec0
[615519.103711] ath: e9d3fe7c
[615522.112719] ath: e9d3fe90
[615522.112747] ath: e9d3feb8
[615522.124228] ath: e9d3fe98
[615522.124229] ath: e9d3fec0
[615522.135711] ath: e9d3fe7c
[615524.144722] ath: e9d3fe90
[615524.144751] ath: e9d3feb8
................

          These messages appear after I patched the ath9k driver. I do not
know why there are these messages.

Yours
Yuan.


2011/1/17 Robert Sombrutzki <sombrutz at informatik.hu-berlin.de>


> Hello,
> we had the same problem using ath9k, which is part of the Compat-wireless
> package (http://wireless.kernel.org/en/users/Download). We're using the
> version 2010-12-16
> (
> http://wireless.kernel.org/download/compat-wireless-2.6/compat-wireless-2010-12-16.tar.bz2
> )
> and same patches from openwrt (backfire). Using this driver, which is newer
> than your driver (Ubuntu), rate selection using the radiotab header doesn't
> work, since the driver ignores the rates. The function "static bool
> __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,struct sk_buff
> *skb)" in net/mac80211/tx.c considers the radiotap flags and nothing else.
> There is already a patch to solve this problem:
> https://patchwork.kernel.org/patch/43026/
>
> Best regards,
> Robert
>
>   On Montag, 17. Januar 2011, 欧阳鑫 wrote:
> > Hi, everyone.
> >
> >      I am running roofnet experiments on 2 Ubuntu hosts with 2.6.32-26
> > kernel. Both are AR5416 cards with ath9k driver. All cards run in Monitor
> > mode.
> >
> >      The problem is that hosts seems to be running under 1Mbps rate ONLY.
> > Command "read srcr/es.bcast_stats" shows:
> > 200 Read handler 'srcr/es.bcast_stats' OK
> > DATA 363
> > 5.167.1.211 00-25-86-A7-01-D3 seq 1295164746 period 30000 tau 300000 sent
> > 12 last_rx 1.762133
> > 5.167.1.211 00-25-86-A7-01-D3 [ 2 60 100 100 198 0 ]
> > 5.167.1.211 00-25-86-A7-01-D3 [ 2 1500 100 100 197 0 ]
> > 5.167.1.211 00-25-86-A7-01-D3 [ 4 1500 0 100 198 0 ]
> > 5.167.1.211 00-25-86-A7-01-D3 [ 11 1500 0 100 196 0 ]
> > 5.167.1.211 00-25-86-A7-01-D3 [ 22 1500 0 100 197 0 ]
> >     I do not  know why fwd_rate with 2Mb/s, 5.5 Mb/s and 11 Mb/s are all
> > 0s.
> >
> >     I forced the data rate to be 5.5Mbps by SetTXRate(11) on PC1, then
> ping
> > PC1 on PC2, then I run tcpdump on PC2, the result is as follows:
> > tcpdump -i wlan0 -n -e -xX
> >
> > 15:59:49.476661 5.5 Mb/s 63dBm tx power [0x00000010] DA:ff:ff:ff:ff:ff:ff
> > SA:PC2-MAC  BSSID:00:00:00:00:00:00 LLC, dsap SNAP (0xaa) Individual,
> ssap
> > SNAP (0xaa) Command, ctrl 0x03: oui Ethernet (0x000000), ethertype
> Unknown
> > (0x0941): Unnumbered, ui, Flags [Command], length 1494
> >         0x0000:  aaaa 0300 0000 0941 0200 87e4 3c00 0b00
>  .......A....<...
> >         0x0010:  dc05 0000 05a7 01d3 0100 0000 75a5 324d
>  ............u.2M
> >         0x0020:  3075 0000 e093 0400                      0u......
> > 15:59:49.476661 1.0 Mb/s [0x0000000f] DA:ff:ff:ff:ff:ff:ff SA:PC2-MAC
> > BSSID:00:00:00:00:00:00 LLC, dsap SNAP (0xaa) Individual, ssap SNAP
> (0xaa)
> > Command, ctrl 0x03: oui Ethernet (0x000000), ethertype Unknown (0x0941):
> > Unnumbered, ui, Flags [Command], length 1494
> >         0x0000:  aaaa 0300 0000 0941 0200 87e4 3c00 0b00
>  .......A....<...
> >         0x0010:  dc05 0000 05a7 01d3 0100 0000 75a5 324d
>  ............u.2M
> >         0x0020:  3075 0000 e093 04                         0u.....
> >
> >  15:59:48.460612 5.5 Mb/s 63dBm tx power [0x00000010] DA:PC1-MAC
> SA:PC2-MAC
> > BSSID:00:00:00:00:00:00 LLC, dsap SNAP (0xaa) Individual, ssap SNAP
> (0xaa)
> > Command, ctrl 0x03: oui Ethernet (0x000000), ethertype Unknown (0x0943):
> > Unnumbered, ui, Flags [Command], length 162
> >         0x0000:  aaaa 0300 0000 0943 0b04 0101 0000 fc7b
>  .......C.......{
> >         0x0010:  0000 0054 0000 0000 0000 0000 0000 0000 ...T............
> >         0x0020:  0000 0000 0000 0000
> > ........
> > 15:59:48.460612 1.0 Mb/s [0x0000000f] DA:PC1-MAC  SA:PC2-MAC
> > BSSID:00:00:00:00:00:00 LLC, dsap SNAP (0xaa) Individual, ssap SNAP
> (0xaa)
> > Command, ctrl 0x03: oui Ethernet (0x000000), ethertype Unknown (0x0943):
> > Unnumbered, ui, Flags [Command], length 162
> >         0x0000:  aaaa 0300 0000 0943 0b04 0101 0000 fc7b
> > .......C.......{
> >         0x0010:  0000 0054 0000 0000 0000 0000 0000 0000
> > ...T............
> >         0x0020:  0000 0000 0000 00
> > .......
> >   It seemed that each packet was caught by tcpdump 2 times, and the 2
> > copies share the same timestamp but different rates.
> >
> >   My second question is why each packet was caught with a rate of 5.5Mb/s
> > first, and then with a rate of 1Mb/s.
> >
> >   The attachment is my configuration file: gen_config_roofnet.pl. I do
> not
> > know if there is some error with the configuration file. Would you help
> me
> > check for it?
> >
> >  Thank you very much!
>
>
>
>