[ath9k-devel] ath9k monitor mode injection packet delay

Hi,

can you try this using pci/pcie devices instead of USB? There may be
USB scheduling things in the way.

On 27 June 2016 at 20:55, Cesar <[email protected]> wrote:
> Hello all,
> We?ve recently tried to test packet injection performace in ath9k monitor
> mode. We set 2 laptops in monitor mode , PC 1 send a 500 Byte packets out,
> and PC 2 return a 500 Bytes packet back at once when it receives the packet
> of PC 1. Then we measured the RTT time and found it's about 1000us !!!
>
> Test environment:
> NIC: AR9287
> driver: ath9k
> system: ubuntu 14.04 with kernel 3.14.57
> send rate : at a fixed rate 54Mb
>
>
> We tried to send packets as "low" as possible in driver stack, and we're
> sure that we disabled the CCA and backoff using flags below:
>
> AR_DIAG_FORCE_CH_IDLE_HIGH
> AR_DIAG_IGNORE_VIRT_CS
> AR_D_GBL_IFS_MISC_IGNORE_BACKOFF
>
> besides we change the aifs to 1 and cwmin cwmax to 0 in ath_txq_setup to
> ensure there's no backoff. we even put our laptaps to a underground garage
> where channel is almost clean.But the test results is still about 1000us....
>
> We've been stucked for serveral months, Any suggestion?
> Any feedback welcome...
> Thnkz in advance!!!
>
> Cesar
>
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