Wifi Ierrs

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Wifi Ierrs

Raimo Niskanen-7
Hello misc!

I have an PC Engines Alix 2d13 with an Atheros AR9280 running WPA2-PSK,
and see a lot of input errors over WiFi.  netstat -ivn shows:

Name    Mtu   Network     Address              Ipkts Ierrs    Opkts Oerrs Colls
athn0   1500  172.17/16   172.17.0.1         1160154 4029261  1485342 61906 0

I have tried calling "netstat -W athn0" with 10 seconds intervals and get
typically over such intervals:

170 input unencrypted packets with wep/wpa config discarded
12 input packets with mismatched channel
8 input packets with mismatched ssid
2 input frames below block ack window start

So is this normal for a congested neighbourhood (6 stories apartment house
- lots of APs around in the house on the 2.4 GHz band), or can anybody think of
a setting to tweak?  The router runs OpenBSD 6.2 stable (patched).

Best regards
--

/ Raimo Niskanen

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Re: Wifi Ierrs

Stefan Sperling-5
On Thu, Jan 11, 2018 at 10:51:32AM +0100, Raimo Niskanen wrote:

> Hello misc!
>
> I have an PC Engines Alix 2d13 with an Atheros AR9280 running WPA2-PSK,
> and see a lot of input errors over WiFi.  netstat -ivn shows:
>
> Name    Mtu   Network     Address              Ipkts Ierrs    Opkts Oerrs Colls
> athn0   1500  172.17/16   172.17.0.1         1160154 4029261  1485342 61906 0
>
> I have tried calling "netstat -W athn0" with 10 seconds intervals and get
> typically over such intervals:
>
> 170 input unencrypted packets with wep/wpa config discarded
> 12 input packets with mismatched channel
> 8 input packets with mismatched ssid
> 2 input frames below block ack window start
>
> So is this normal for a congested neighbourhood (6 stories apartment house
> - lots of APs around in the house on the 2.4 GHz band), or can anybody think of
> a setting to tweak?  The router runs OpenBSD 6.2 stable (patched).
>
> Best regards
> --
>
> / Raimo Niskanen
>

These are the numbers for my AP at home:

$ netstat -nI athn0
Name    Mtu   Network     Address              Ipkts Ierrs    Opkts Oerrs Colls
athn0   1500  <Link>      04:f0:21:17:3c:6a  2235626 123714  3743974 43802     0

The wifi network is usable but relatively slow.

This same card worked perfectly fine on a clean wifi channel up in
the Canadian mountains where there was virtually no interference.
Up there I got about 3MB/s transfer rates if I recall correctly.

After some code inspection I've done recently I came to the conclusion
that this problem might be due to the fact that our driver does not
run the regular calibration routines which other OS drivers use.
If someone looked into that it might help fix the known issues we
have with these devices. There is calibration code in our driver
already but most of it is not being called yet. And what's there now
needs to be cross-checked with other OSs since there are probably bugs.

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Re: Wifi Ierrs

Raimo Niskanen-7
On Thu, Jan 11, 2018 at 01:43:11PM +0100, Stefan Sperling wrote:

> On Thu, Jan 11, 2018 at 10:51:32AM +0100, Raimo Niskanen wrote:
> > Hello misc!
> >
> > I have an PC Engines Alix 2d13 with an Atheros AR9280 running WPA2-PSK,
> > and see a lot of input errors over WiFi.  netstat -ivn shows:
> >
> > Name    Mtu   Network     Address              Ipkts Ierrs    Opkts Oerrs Colls
> > athn0   1500  172.17/16   172.17.0.1         1160154 4029261  1485342 61906 0
> >
> > I have tried calling "netstat -W athn0" with 10 seconds intervals and get
> > typically over such intervals:
> >
> > 170 input unencrypted packets with wep/wpa config discarded
> > 12 input packets with mismatched channel
> > 8 input packets with mismatched ssid
> > 2 input frames below block ack window start
> >
> > So is this normal for a congested neighbourhood (6 stories apartment house
> > - lots of APs around in the house on the 2.4 GHz band), or can anybody think of
> > a setting to tweak?  The router runs OpenBSD 6.2 stable (patched).
> >
> > Best regards
> > --
> >
> > / Raimo Niskanen
> >
>
> These are the numbers for my AP at home:
>
> $ netstat -nI athn0
> Name    Mtu   Network     Address              Ipkts Ierrs    Opkts Oerrs Colls
> athn0   1500  <Link>      04:f0:21:17:3c:6a  2235626 123714  3743974 43802     0
>
> The wifi network is usable but relatively slow.
>
> This same card worked perfectly fine on a clean wifi channel up in
> the Canadian mountains where there was virtually no interference.
> Up there I got about 3MB/s transfer rates if I recall correctly.
>
> After some code inspection I've done recently I came to the conclusion
> that this problem might be due to the fact that our driver does not
> run the regular calibration routines which other OS drivers use.
> If someone looked into that it might help fix the known issues we
> have with these devices. There is calibration code in our driver
> already but most of it is not being called yet. And what's there now
> needs to be cross-checked with other OSs since there are probably bugs.

Ok.  Interesting to know, but unfortunately way out of my competence
domain...  I hope for others to pick up this ball.

--

/ Raimo Niskanen, Erlang/OTP, Ericsson AB