[ath9k-devel] High speed UDP traffic

[ath9k-devel] High speed UDP traffic

[Valentin Manea]

Hi,


  I've been experimenting the last days hacking the ath9k & mac drivers 
to get the highest possible UDP throughput from an AP to a station. 
Unfortunately I'm stuck at 6.6 MB/s and I cannot figure how to get past 
this - I'm using 2 Dlink PCMCIA ar5008 based boards - and if possible I 
would like some suggestions.
This is my situation now:
* basically the packets are being sent as AMPDU and I've turned off the 
retries due to bad reception, I've tried disabling BlockAck in the 
receiver, but as soon as I've done that it seems the TX rate falls to 
0.4MB/s and I don't really understand why.
    - could it be something I missed or is it something hardware related?


Thanks,
Valentin

[ath9k-devel] High speed UDP traffic

[Ranga Rao Ravuri]

may be it is worth adding details, like what AP you are using etc details. 
you can check rate statistics to check what rate being used ?

you can achieve more than 150 mbps only when aggregation is enabled. For 
aggregates to go well, you need blockAck. I do not know how you achieve 
high throughput without block ack ?, 
~ R


On Thu, 8 Oct 2009, Valentin Manea wrote:

> Hi,
> 
> 
>   I've been experimenting the last days hacking the ath9k & mac drivers
> to get the highest possible UDP throughput from an AP to a station.
> Unfortunately I'm stuck at 6.6 MB/s and I cannot figure how to get past
> this - I'm using 2 Dlink PCMCIA ar5008 based boards - and if possible I
> would like some suggestions.
> This is my situation now:
> * basically the packets are being sent as AMPDU and I've turned off the
> retries due to bad reception, I've tried disabling BlockAck in the
> receiver, but as soon as I've done that it seems the TX rate falls to
> 0.4MB/s and I don't really understand why.
>     - could it be something I missed or is it something hardware related?
> 
> 
> Thanks,
> Valentin
> _______________________________________________
> ath9k-devel mailing list
> ath9k-devel at lists.ath9k.org
> https://lists.ath9k.org/mailman/listinfo/ath9k-devel
> 

[ath9k-devel] High speed UDP traffic

[Valentin Manea]

Actually after snooping around I found out the Dlink card was to blame, 
it's rate_max_phy was to 72000 kbps. I've tried a different PCI board 
and now the stream goes up to 160000 kbps. So I guess it all depends on 
the radios in this boards.

Thanks for your help,
Valentin

On 10/09/2009 08:13 AM, Ranga Rao Ravuri wrote:
> may be it is worth adding details, like what AP you are using etc details.
> you can check rate statistics to check what rate being used ?
>
> you can achieve more than 150 mbps only when aggregation is enabled. For
> aggregates to go well, you need blockAck. I do not know how you achieve
> high throughput without block ack ?,
> ~ R
>
>
> On Thu, 8 Oct 2009, Valentin Manea wrote:
>
>    
>> Hi,
>>
>>
>>    I've been experimenting the last days hacking the ath9k&  mac drivers
>> to get the highest possible UDP throughput from an AP to a station.
>> Unfortunately I'm stuck at 6.6 MB/s and I cannot figure how to get past
>> this - I'm using 2 Dlink PCMCIA ar5008 based boards - and if possible I
>> would like some suggestions.
>> This is my situation now:
>> * basically the packets are being sent as AMPDU and I've turned off the
>> retries due to bad reception, I've tried disabling BlockAck in the
>> receiver, but as soon as I've done that it seems the TX rate falls to
>> 0.4MB/s and I don't really understand why.
>>      - could it be something I missed or is it something hardware related?
>>
>>
>> Thanks,
>> Valentin
>> _______________________________________________
>> ath9k-devel mailing list
>> ath9k-devel at lists.ath9k.org
>> https://lists.ath9k.org/mailman/listinfo/ath9k-devel
>>
>>