Ralink RT2860 frame aggregation

[Ramanujan Seshadri]

It's in the NIC. But it seems that it sometimes aggregates more than the
set BA win size (in the driver).  In fact i was wondering - if it can
actually achieve up to 80 Mbps throughput with just 8 frames aggregated. In
fact the aggregation size doesn't seem to matter much for the throughput
because any aggregation from 5-8 seems to get the same throughput. So, i
was wondering if this is something weird in NIC or can we do some thing to
control it in the driver ?

ram


On Thu, Oct 10, 2013 at 4:41 PM, Adrian Chadd <adrian at freebsd.org> wrote:

> I forget .. is the driver or the NIC itself doing aggregation?
>
>
> -a
>
>
> On 10 October 2013 10:33, Ramanujan Seshadri <ksramanujan at gmail.com>wrote:
>
>> Hello all,
>>   i was testing some features of ralink rt2860 driver. i saw a bit weird
>> results. below is the result of what i saw. The throughput achieved
>> doesn't
>> change much when the MPDU aggregation in an AMPDU goes from 3 to 8. And
>> also, the driver doesn't seem to aggregate more than 8 MPDU's in an AMPDU
>> even when the BA win size is set to max of 64. i was testing this by
>> fixing
>> the rate at MCS 15
>>
>>  Is there anything else i need to do to force the driver to aggregate more
>> MPDU's in an AMPDU ?
>>
>>
>>
>> BA Win Size           No. of MPDU's            Throughput(Mbps)
>>                                 aggregated
>>
>> 1. 64                             7-8                            85.7
>>
>> 2. 32                             6-7                            84.2
>>
>> 3. 16                             6-7                            81.7
>>
>> 4.  8                              6-7                            79.9
>>
>> 5.  4                               5                              84.7
>>
>> 6.  2                               3                              71.8
>>
>> 7.  1                               2                              73.5
>>
>>
>> Thanks
>> ram
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>
>