Bad outbound performance with Intel 6205 [Taylor Peak] WiFi (IWN)

[Kevin Oberman]

I am seeing poor performance on my WiFi that seems to have deteriorated
since FreeBSD V11.0. I see an average of about 35 errors for every packet
transmitted.
wlan0  1500 <Link#3>      a0:88:b4:c6:ad:28 14501195     0     0   367667
12886354     0

I have always seen lot of errors on transmission on this interface, but I
have recently noticed that uploads were very slow. They seem to max out at
about 20 Mbps (bits, not bytes). For "normal" traffic (as opposed to test
traffic) it is often much worse, often topping out at around 2 or 3 Mbps.

No input errors at all and god download performance.

Are others seeing this? Any suggestions for troubleshooting? I don't see
much in the way of statistics or diagnostic information on iwn. the man
page gives me no clues.

Kevin Oberman, Part time kid herder and retired Network Engineer
E-mail: rkoberman at gmail.com
PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683