On Wed, May 20, 2020 at 10:06 AM Stefan Sperling <[email protected]> wrote:
> On Tue, May 19, 2020 at 11:12:01PM +0200, stolen data wrote: > > trying to transfer the same 440 MiB file but on 802.11n > > ======================================================= > > > > the machine's network freezes repeatedly, and ping(8) outputs lots of: > > > > ping: sendmsg: No buffer space available > > ping: wrote 192.168.1.1 64 chars, ret=-1 > > > > --- 192.168.1.1 ping statistics --- > > 348 packets transmitted, 227 packets received, 34.8% packet loss > > round-trip min/avg/max/std-dev = 29.615/2467.639/6041.608/1004.679 ms > > This looks like one of the two antennas isn't connected to the device. > > Please check antennas and if that doesn't resolve it, try this workaround: > > ifconfig athn0 nwflag nomimo > The antennas are just fine - as I mentioned, when rebooting the PC into Linux (same hardware, same wireless access point etc.) this WiFi card performs perfectly, with no packet loss, low latencies, and maxes out transfers at about 22 Mbit/s on 11g and about 70 Mbit/s on 11n. The wireless network is on a 2.4 GHz / 20 MHz channel, by the way. Thanks for the "nomimo" flag hint! It does nothing on 11g but improves some for 11n: the 35% packet loss goes down to ~1% and it more or less performs identically to 11g, with very jumpy latency and xfer speeds swinging up and down between 200 and 1200 KBit/s. This is still just a fraction of what 11g/n is capable of so something is clearly not working correctly with athn(4), at least not for AR9287.
