[ath9k-devel] Performance degradation when monitor mode interface is created

[Ali Abedi <a2abedi@uwaterloo.ca>]

So, why the monitor interface has no effect on the receiver client? What 
you mentioned should be true on the receiving side as well.

Thanks,
Ali

On 9/4/2012 9:21 AM, abhinav narain wrote:
> monitor interface is a virtual interface. So, two interfaces are 
> taking the same physical resource and there is a context switch while 
> going back and forth !
> This will decrease the throughput as the actual interface is getting 
> less time to sense the channel.
> Thats what I think !
> -
> Abhinav Narain
>
> On Tue, Sep 4, 2012 at 3:28 AM, Ali Abedi <a2abedi@uwaterloo.ca 
> <mailto:a2abedi@uwaterloo.ca>> wrote:
>
>     Hello,
>
>     In our experiments, we use iperf to saturate the wireless link.
>     When we
>     create the monitor mode interface on the "sender" client the
>     throughput
>     drops to 25Mbps from 29Mbps. The throughout is not affected if the
>     monitor mode interface is created on the receiver client through. we
>     have tried various versions of ATH9K but we observed the same
>     behavior,
>     Why the monitor mode interface on the sender client affects the
>     throughput? Is this a bug? We are almost sure that this is not a
>     performance limitation of our clients.
>
>     Thank you,
>     Ali Abedi
>
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>

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