Stefan Sperling writes:
> On Thu, Dec 31, 2020 at 02:28:35PM +0000, Björn Gohla wrote: >> Hi all, [...] >> So how do I get the it? Am I looking in the wrong place, or does the >> driver just not expose this information? > > Rate/MCS + channel width + some other parameters map to a Tx bitrate: > https://en.wikipedia.org/wiki/IEEE_802.11n-2009#Data_rates > > This Tx bitrate will vary on a per-frame basis, though. And actual user data > throughput is always below this, due to protocol overhead, re-transmissions, > interference, other traffic on the same channel, and so on. Right, so by using the values in that table one could extract a nominal Tx rate, but not the actual one (much less the Rx); correct? >> The interface is a "Realtek Wireless N Nano USB Adapter" in case that is >> relevant. > > OpenBSD realtek wifi drivers only support 11g mode at present. > So on such hardware the kernel and ifconfig never report "MCS23". > MCS are only reported for 11n/ac modes. I did notice that it says so in the caveats in urtwn(4), strange. > In 11g mode the per-frame Tx rate is displayed by ifconfig in Mbit/s. > However, some realtek devices (like the 8192CU) perform Tx rate-adjustment > in firmware and do not even expose the chosen Tx data rate to the driver. > In that case ifconfig always displays 54M which is usually incorrect. ifconfig says this: urtwn0: flags=808843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,AUTOCONF4> mtu 1500 lladdr 54:2a:a2:4c:0e:b5 index 8 priority 4 llprio 3 groups: wlan egress media: IEEE802.11 autoselect (OFDM54 mode 11g) status: active ieee80211: join "451UnavailableForLegalReasons " chan 11 bssid b0:bb:e5:13:7b:d4 -72dBm wpakey wpaprotos wpa2 wpaakms psk wpaciphers ccmp wpagroupcipher tkip inet 192.168.1.182 netmask 0xffffff00 broadcast 192.168.1.255 I suppose the "media" line is what you're referring to here, right? dmesg says: urtwn0 at uhub0 port 2 configuration 1 interface 0 "Realtek Wireless N Nano USB Adapter" rev 2.10/2.00 addr 2 urtwn0: MAC/BB RTL8192EU, RF 6052 2T2R, address 54:2a:a2:4c:0e:b5 the device looks similar to the one you mentioned, so maybe that's what's going on here. > What problem are you trying to solve? I just want to show the network activity in my desktop status line. -- Cheers, Björn
