On Wed, Jan 03, 2018 at 07:47:58PM +0100, Matthias Schmidt wrote: > As strange as this sounds, switching to 5Ghz made the slowdown > disappear. I set mode to 11n and chan to 60 and I no longer see the > effect. Going back to 2.4Ghz and I see the slowdown again after some > time.
I think a packet capture could shed some light on this. I would not be surprised if slowdowns coincide with your neighbours watching video streams or something over wifi. I use a separate iwn(4) device in monitor mode for this, and: tcpdump -n -i iwn0 -s 4096 -y IEEE802_11_RADIO -w /tmp/iwn.pcap This captures data, management, and control frames. Most other drivers omit some of these which makes it hard to figure out what's going on. If you open iwn.pcap in wireshark you can go to Wireless -> WLAN Traffic to see some aggregated stats of what's going on around you.
