Re: Ksoftirqd/0 eating all my CPU while transfer

After some tests I've noted that all madwifi versions 0.9.4 are CPU intensive while in AP mode.
I did some tests with madwifi 0.9.3 and the problem stopped.

Is there a way to implement minstrel rate in 0.9.3 driver ?

Thanks in advance,

Gleidson
  ----- Original Message ----- 
  From: Gleidson Antônio Henriques 
  To: Brett Wright ; [email protected] 
  Sent: Tuesday, December 15, 2009 3:09 PM
  Subject: Re: [Madwifi-users] Ksoftirqd/0 eating all my CPU while transfer


  Thanks for your response Brett, 

     I tried disable Interference Mitigation but the problem still occurs.
     
     Thanks in advance,

      Gleidson

    ----- Original Message ----- 
    From: Brett Wright 
    To: Gleidson Antônio Henriques ; [email protected] 
    Sent: Tuesday, December 15, 2009 12:23 AM
    Subject: RE: [Madwifi-users] Ksoftirqd/0 eating all my CPU while transfer


    Hi,

     

    I have seen similar things on an AP when interference mitigation is turned on.

    You can try turning this off using something like:

     

    echo 0 > /proc/sys/net/dev/wifi0/intmit

     

    (your proc file location might be slightly different). This should free up your CPU but your throughput may suffer depending on the level of interference.

     

    Brett

     


----------------------------------------------------------------------------

    From: Gleidson Antônio Henriques [mailto:[email protected]] 
    Sent: Tuesday, 15 December 2009 10:18 AM
    To: [email protected]
    Subject: [Madwifi-users] 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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