Date: Tue, 19 Aug 2014 21:53:11 +0200 From: Johannes Dieterich <dieterich.joh@gmail.com> To: freebsd-wireless@freebsd.org Subject: iwn: Intel Centrino 6205 bad 11n performance Message-ID: <CABquGzVryyUoOo82fe9WqR2g53fgkZpUdVRiz_TAR8MfW49Z=w@mail.gmail.com>
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Dear all,
I have a Intel Centrino Advanced-N 6205 WLAN NIC in my Thinkpad using iwn.
iwn0@pci0:3:0:0: class=0x028000 card=0x13118086 chip=0x00858086 rev=0x34
hdr=0x00
vendor = 'Intel Corporation'
device = 'Centrino Advanced-N 6205 [Taylor Peak]'
class = network
Unfortunately, I only get a rather bad speed using CURRENT (r270098) out of
the chip. It is connected to an 11n (on the 2.4 GHz band) network:
wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
media: IEEE 802.11 Wireless Ethernet MCS mode 11ng
status: associated
ssid XXXXX channel 4 (2427 MHz 11g ht/20) bssid XXXXXXXXXX
country US authmode WPA2/802.11i privacy ON deftxkey UNDEF
TKIP 2:128-bit txpower 15 bmiss 10 scanvalid 60 bgscan bgscanintvl 300
bgscanidle 250 roam:rssi 7 roam:rate 64 protmode CTS ampdulimit 64k
ampdudensity 8 -amsdutx amsdurx shortgi wme roaming MANUAL
I get a maximum of 900 KB/s of throughput (both in/out, approximated by
copying a large file using scp), within the network and to the outside
world. Running SuSE Linux on the notebook allows me to easily saturate my
uplink at > 3MB/s, didn't then further check within the network. I get no
log messages on FBSD from iwn and I am not located in a particularly noisy
neighborhood.
The only performance issue I can find with this chip is one old report on
Ubuntu (http://ubuntuforums.org/showthread.php?t=1949571), where the 11n
seemed to be the culprit in the driver/firmware. Could this be an issue for
us as well (firmware problem?)?
As my workhorse is FreeBSD, I'd love to fix this issue. How can I further
debug this issue and/or provide more data? I know that the status of iwn in
FBSD is difficult ATM but maybe there is hope?
Best
Johannes
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