Ksoftirqd/0 eating all my CPU while transfer

Hi all,

    I'd encountered a problem with different versions of Madwifi + different versions of kernels and I'm totally lost.
    My scenario is: 2 - Alix.2D2 ( One configured as AP and another configured as Station )
                           2 - Wireless Card ( Model: CM9-GP )
                           Madwifi driver version 0.9.4 ( but already tested with latest trunk version )
                           Kernel 2.6.21 ( but already tested against other versions of kernel )
                           
    If i grab one file from AP using the Station, ksoftirqd at AP starts to eat all my CPU until the transfer stops.
    I achieve  3,1 MB/s throughtput rate but I lost my entire CPU.
    
    I don't know how it could be possible but if I install voyage-linux distro 0.6.2 ( with madwifi driver version 0.9.4+r4022.20090513-1+6.0-3 ), I can
    achieve the same throughput without the stress on CPU.

    Is there anyone that encountered this kind of problem ?
    
    Thanks in advance,

    Gleidson Antonio Henriques

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