[Make-wifi-fast] [PATCH RFC/RFT 4/4] mac80211: Apply Airtime-based Queue Limit (AQL) on packet dequeue

[Peter Oh]

On 9/19/19 10:54 AM, Peter Oh wrote:
>
> On 9/19/19 10:46 AM, Ben Greear wrote:
>> On 9/19/19 10:44 AM, Peter Oh wrote:
>>> On 9/19/19 5:22 AM, Toke Høiland-Jørgensen wrote:
>>>> From: Toke Høiland-Jørgensen <toke at redhat.com>
>>>>
>>>> This patch ports that idea over to mac80211. The basic idea is simple
>>>> enough: Whenever we dequeue a packet from the TXQs and send it to the
>>>> driver, we estimate its airtime usage, based on the last recorded 
>>>> TX rate
>>>> of the station that packet is destined for.
>>>
>>> The way to decide the last recorded TX rate could be vary among 
>>> drivers. In terms of ath10k driver and FW, they use 4 PPDUs to 
>>> update the Tx rate. Isn't it too small sampling number to be used 
>>> for AQL?
>>
>> Probably it is not exactly the last 4 either, since the report comes 
>> back indirectly and not
>> synchronized with the tx path?
>>
The point of my question is "the last recorded Tx rate is derived from 
small number of PPDUs and if it's OK to use it for AQL calculation or not".

Thanks,

Peter