Date: Mon, 2 Dec 2013 23:47:49 -0800 From: "R. Tyler Croy" <tyler@monkeypox.org> To: freebsd-wireless@freebsd.org Subject: iwn(4) driver showing poor performance, variable media selection on 10.0-BETA3 Message-ID: <20131203074749.GE14900@kiwi.coupleofllamas.com>
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I recently installed FreeBSD 10.0-BETA3 onto my Thinkpad X200, everything is
largely running fine except the wireless performance leaves a lot to be
desired.
I've got an older Thinkpad T43 running -CURRENT next to the X200 in the same
exact room, same distance from the AP, but with an iwi(4) card in it.
The T43 will download large files between 100-200KB/s, and the "media" mode for
wlan0 is "OFDM/48Mbps" which seems non-crazy.
The X200 however will get between 20-90KB/s on the same files, and the "media"
mode will oscillate *dramatically* during the transfer. I've watched it go from
OFDM/54Mbps, down to 48Mbps, to 16Mbps, to DS/1Mbps which is where it seems to
idle.
I've started looking at the output of wlanstats(1) and nothing jumps out at me,
then again, I'm a noob so what do I know:
[23:35:28] tyler:~ $ wlanstats
8 rx frame too short
30 rx from wrong bssid
802156 rx discard 'cuz dup
4 rx discard 'cuz mcast echo
172272 rx beacon frames
175177 rx element unknown
996 rx frame chan mismatch
61 rx seq# violation (TKIP)
42 active scans started
41 background scans started
1072961 tkip crypto done in s/w
405918 tkip tx MIC done in s/w
667043 tkip rx MIC done in s/w
173976 rx management frames
667045 total data frames received
663976 unicast data frames received
3069 multicast data frames received
406278 total data frames transmit
405920 unicast data frames sent
1M current transmit rate
22 current rssi
-86 current noise floor (dBm)
-64 current signal (dBm)
The only thing that looks removely suspicious is the "rx discard" segment, but
again, I plead noob.
Any pointers would be useful and appreciated!
- R. Tyler Croy
------------------
Code: https://github.com/rtyler
Chatter: https://twitter.com/agentdero
rtyler@jabber.org
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