Wep problem

Dan Williams dcbw at redhat.com
Mon Aug 15 18:53:35 EDT 2011

On Fri, 2011-08-05 at 12:02 +0200, Cyril HAENEL wrote:
> Hello all,
> I use a marvell 8385 based CF card on a blackfin processor board 
> (bf537), and I found a strange problem. For now I am not able to 
> determine if the problem comes from libertas driver or not.
> I fact, when the wifi is configured without WEP encryption, everything 
> works very well, the transfer rate is very good, more than 1200KB/s. But 
> when the wifi is configured with a WEP encryption key, the transfer rate 
> fall decrease completely when 2 processes use the network.
> But when there is only one process which use the network the transfer 
> rate is normal !!
> For example :
> curl -O  --> transfer rate more than 
> 1200KB/s on the complete 10MB file size.
> And if there is at least another process using network, transfer rate 
> fall completely :
> curl -O & ping  --> transfer 
> rate fall to <10Ko/s, and ping delay increase up to 1700ms !!!!!!!
> It's really an annoying problem, and for now I just want to determine if 
> the problem comes from the libertas driver or if the problem is 
> elsewhere. Is someone knows where the WEP encryption is done ? In the 
> libertas driver or in the kernel ?

It's done in the card's firmware, not in the kernel or the driver.  The
firmware passes back a completely decrypted packet to the driver.


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