2009/9/22 Qasim Javed <qas...@gmail.com>: > Hi, > > I have a gentoo system and the latest Ath5k drivers from compat-wireless. I > downloaded them about a week back. I understand that the tarball is updated > daily. > > I have three Ubiquiti SRC cards (AR5212). I have configured one of them as > an AP in 802.11a mode using channel 149. The other two are stations > connected to the AP. I fixed the rate to 6Mbps. > > I have an iperf server running on the AP which accepts UDP traffic. One of > the stations sends UDP packets at a rate of 6Mbps to the AP. Because there > are no surrounding APs in 802.11a mode, the band is very quiet. However, I > am surprised that I get 2.6% packet loss when I run the above mentioned > experiment. The distance of both stations is no more than 10 meters from the > AP. Also, the txpower for both STAs is 30dbm. > > One STA sends UDP packets to the AP at 6Mbps for 30 seconds and the report > that iperf generates is as follows: > > [ ID] Interval Transfer Bandwidth Jitter > Lost/Total Datagrams > [ 3] 0.0-30.1 sec 18.3 MBytes 5.11 Mbits/sec 0.301 ms 352/13434 (2.6%) > > Considering that there is no activity on this channel except the beacons of > AP and probe requests/responses from the other STA, how can 352 packets get > lost? > > To make things worse, I tried the above experiment with minimal bandwidth. > Very oddly, the results are as follows: > > [ ID] Interval Transfer Bandwidth Jitter > Lost/Total Datagrams > [ 3] 0.0-31.0 sec 44.5 KBytes 11.8 Kbits/sec 0.060 ms 1/ 32 (3.1%) > > Why would even a packet get lost at this very slow data rate? I have > repeated the above several times, and it always results in about the same > numbers. > > Earlier, I had also noticed that if I ping one STA from the other STA, about > every 10 seconds, the ping response time jumps from 0.8 milliseconds to 25 > milliseconds. > > I would be really grateful if I can get some feedback fro myou guys on this > so that we can fix whatever is messing things up here. > > Thanks, > -Qasim
Try reducing tx power and see how it goes... -- GPG ID: 0xD21DB2DB As you read this post global entropy rises. Have Fun ;-) Nick _______________________________________________ ath5k-devel mailing list ath5k-devel@lists.ath5k.org https://lists.ath5k.org/mailman/listinfo/ath5k-devel
