Maybe you need to put some distance between the 3 devices. We experienced this kind of problem on radios close to each other (around 10cm). It was due to radio signals inducing themselves in the PCB of another nearby radio, causing the other radio to badly transmit and receive. > -----Message d'origine----- > De : linux-wireless-owner@xxxxxxxxxxxxxxx [mailto:linux-wireless-owner@xxxxxxxxxxxxxxx] De la part de > Marlon Smith > Envoyé : mercredi 29 janvier 2020 19:40 > À : linux-wireless@xxxxxxxxxxxxxxx > Objet : Strange performance issue when using two devices at once > > Hi everyone, > > I have two RT5370 devices connected to the same access point. Both > devices are very slow, but the instant I disconnect one device, the > other speeds up by a factor of 10. > > The really strange part is that one device will perform slowly even if > the other device is basically idle! I've confirmed this with a packet > sniffer. > > I've been trying to do some debugging, and I've found that when both > devices are connected to the access point, they report a large number > of duplicate frames. I added some debug output > in ieee80211_rx_h_check_dup() to confirm that this only happens while > both devices are connected. The packet sniffer also shows a large > number of retries while this is occurring. > > Using backports 5.3-rc4 for this, but also tested on 4.14-rc2. > > I did post about this previously on this mailing list (RT5370 > performance issues), but I thought I'd post again with this new > information and more descriptive title. I'm a little bit stuck on this > for a while now, so any ideas are much appreciated. > > Thanks! > > Marlon
