Hi,

You can try disabling 11n (ifconfig -ht) but besides that, there's no
real iwn maintainer or anyone who wants to get really nitty gritty
into what the driver is doing. So until that happens, I think we're
short of luck. :(


-a


On 19 August 2014 12:53, Johannes Dieterich <dieterich....@gmail.com> wrote:
> 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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