Re: Problem with transfer rate.

From: Samuel Partida (
Date: 2002-06-18 19:20:01 UTC

On Mon, 17 Jun 2002 20:28:46 +0300
Jouni Malinen <> wrote:

> On Fri, Jun 14, 2002 at 08:10:12PM +0200, Samuel Partida wrote:
> > iwconfig shows a transfer rate of 11mbps and a link of 72/92 but doing
> > transfer of big files from one machine to another, i can't get more than
> > 80kbyte/sec, i had the same problem trying from two conceptronics and
> > i've tested it in Ad-Hoc mode even changing many settings with
> > iwconfig like the freqs and channels and txpower and some more without
> > having any solution.
> I'm assuming that transfer was using TCP. Have you tested performance with
> UDP? I have seen some cases in which a Prism2-based cards have stopped
> ACKing received frames which will cause huge performance issues
> (all packets being retried many times). However, this should show up
> in the other end's kernel debug log (assuming you are using Host AP driver
> in both hosts) as TX Exc messages. Anyway, you might test setting maximum
> retry count to zero or one (iwconfig wlan0 retry 0) and check the
> performance with this configuration.
> Raw 802.11 dump (e.g., with 3rd card in monitor mode) could be
> useful for determining the cause for the poor performance if there is no
> entries in dmesg output to help with this. I would check for ACKs and
> too frequent retries.
> --
> Jouni Malinen PGP id EFC895FA

Ok, i've tried all and i've discovered something that i didn't realize before. On my Linux box, iwconfig says that the bit rate is of 2mbps and it never goes up, i've tried to change it with iwconfig wlan0 rate 11M but nothing appears... don't know why, now i have my laptop near the Linux box with a link of 92/92... i don't know what is happening.

Can you someone help me??


     Samuel Partida Amores
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