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

[Hrant Dadivanyan]

On 04/20/18 06:37, Kevin Oberman wrote:
> 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.>

iwn0 at pci0:3:0:0:        class=0x028000 card=0xc2208086 chip=0x00858086
rev=0x96 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Centrino Advanced-N 6205 [Taylor Peak]'
    class      = network

iwn0: <Intel Centrino Advanced-N 6205> mem 0xf0c00000-0xf0c01fff at
device 0.0 on pci2

Name    Mtu Network       Address              Ipkts Ierrs Idrop
Ibytes    Opkts Oerrs     Obytes  Coll
wlan0  1500 <Link#5>      84:3a:4b:cb:aa:c0  3914486     2     0
5523440357     7685 2087124     888555     0

The same 6205, I didn't notice bad upload performance though.

Numbers of Ipkts and Oerrs are close enough and Opkts is too small
compared to Ipkts, so I believe the driver misbehaves a bit and
erroneously shows number of output packets as Oerrs.
The Obytes also seems to be too small to be correct.

A few months ago the association with AP starts sometimes to stall with
no traffic in/out at all, reconfig in wpa_cli helps then. Looks like it
correlates with upgrade from 10-stable to 11, but I'm not so sure.

> Kevin Oberman, Part time kid herder and retired Network Engineer
> E-mail: rkoberman at gmail.com
> PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683
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-- 
Hrant Dadivanyan (aka Ran d'Adi)                hrant(at)dadivanyan.net
/* "Feci quod potui, faciant meliora potentes." */       ran(at)psg.com

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