Centrino Advanced-N 6235 on Asus Zenbook UX32VD poor performance

[Stefan Parvu]

Hi,

Im running FreeBSD nereid 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r268622 on my laptop.
I am not able to get a decent network throughput when doing scp or ftp. Strange is no matter 
what I use for transfer I get same speed: around 400KB/sec. Even scp or ftp ... 

I tried to disable bgscan on the wlan0 interface, no success. See below, my settings:

1. device:

iwn0 at pci0:3:0:0:	class=0x028000 card=0x40608086 chip=0x088e8086 rev=0x24 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Centrino Advanced-N 6235'
    class      = network

2. interface

iwn0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 2290
	ether c4:85:08:a3:4e:09
	nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
	media: IEEE 802.11 Wireless Ethernet autoselect mode 11ng
	status: associated
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
	options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
	inet6 ::1 prefixlen 128 
	inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2 
	inet 127.0.0.1 netmask 0xff000000 
	nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	ether c4:85:08:a3:4e:09
	inet 192.168.1.171 netmask 0xffffff00 broadcast 192.168.1.255 
	nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
	media: IEEE 802.11 Wireless Ethernet MCS mode 11ng
	status: associated
	ssid sdr channel 6 (2437 MHz 11g ht/20) bssid cc:5d:4e:ee:2c:69
	country US authmode WPA2/802.11i privacy ON deftxkey UNDEF
	AES-CCM 2:128-bit txpower 15 bmiss 10 scanvalid 60 protmode CTS
	ampdulimit 64k ampdudensity 8 -amsdutx amsdurx shortgi wme
	roaming MANUAL

Any ideas if this chip is well supported or are there current issues with the driver for this device ?
Running Debian 7 on this machine let me to get 7-9MB/sec easily.

Thanks,

-- 
Stefan Parvu <sparvu at systemdatarecorder.org>