On 20 November 2016 at 02:07, Bob Copeland <me@xxxxxxxxxxxxxxx> wrote: > On Fri, Nov 18, 2016 at 10:43:06PM +0100, Matteo Grandi wrote: >> So the question is: who decide if use MIMO and higher MCS hopefully on >> 80MHz channel or not? Is the firmware? Is there a way to force the >> interface to use 80MHz and/or MIMO? (iw provide the possibility to >> choose between [HT20/HT40-/HT40+]). > > You can specify the channel width like so: > > iw dev wlan0 set freq 5745 80 5775 > iw dev wlan0 mesh join mesh-vht With recent enough `iw` you can check the operational (max) bandwidth of the interface with: iw dev wlan0 info I don't know how mesh nodes negotiate their capabilities to each other though so I don't know how reliable this is. Actual modulation is picked by rate control in firmware. You can try to force a fixed rate with[1]: iw dev wlan0 set bitrates legacy-5 ht-mcs-5 vht-mcs-5 1:9 It doesn't allow setting fixed bandwidth though so you'll need to check rx bitrate on the receiving end to verify. [1]: https://wireless.wiki.kernel.org/en/users/drivers/ath10k/debug?s[]=set&s[]=bitrates#manual_bitrates_configuration Michał
