Le Sat, 26 Jul 2008 10:54:41 -0500, Larry Finger <Larry.Finger@xxxxxxxxxxxx> a écrit : > Felix Fietkau wrote: > > I don't know if it helps with debugging this issue, but I've seen > > the same on a laptop from a friend of mine (same card). > > > > After some searching I found that setting the AP to g-only mode > > instead of b+g mixed made it work at decent speeds. Another symptom > > of this slowdown is that there is typically an unnaturally high > > number of retransmissions on the air, which eats up a lot of > > airtime. > > > > I've spent some time looking through the code to find the reason > > for this but couldn't find anything yet (maybe somebody from Intel > > could help). > > Just for comparison, my BCM4312 running b43 from the latest > wireless-testing gets the following tcpperf throughput: > > AP Mode TX RX > > Mixed b/g 19.8 MB/s 23.0 MB/s > g-only 20.5 MB/s 23.1 MB/s > > For these tests, the connecting end was wired to the router. The > difference in TX speeds was about what I expected - the small > difference in RX speeds was not. In any case, if you see a large > difference with iwl3945, that would be useful information. > > You can obtain tcpperf from > http://wand.cs.waikato.ac.nz/~stj2/nsc/software.html hello thanks for your answers. i tried to set my ap to g-only, but i cannot :-( the wifi box is given by my provider and it seems cannot be changed... so i tried tcpperf, this is the result : cedric:/home/grisbi/tcpperf-1.754# ./tcpperf -c 192.168.0.4 -t 30 Duration: 30 9482usec Bytes sent: 5481472 (5353 kB 5 MB 0 GB) Bandwidth: 1461264 b/s (1461.26 kb/s 1.46 Mb/s) Close duration: 0s 22usec then i tried to download an image of ubuntu and i had about 900kb/s, so very good and i don't understand... then i tried to send a big file with scp to the other computer, as user and as root, it begins at 2,2MB/s and decrease untill 150kb/s and stays between 130-200kb/s i did again a tcpperf with -t 300 to check if it's not with the time, but i have 1,30MB/s, seems correct. second test : i stop the wifi and plug a cable. the second computer is still in wifi. tcpperf gives me 17Mb/s and the same file with scp is sent with about 2,2MB/s... so now i really don't understand, from internet, loading work untill 900kb/s (ok for me), but beween 2 computers on my network i have max 200kb/s... hopes this can be usefull thanks cedric -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
