Since upgrading my system to 10.0-RC# and now 10.0-RC5, by wireless
performance has severely degraded.

iwn0@pci0:3:0:0:    class=0x028000 card=0x13118086 chip=0x00858086 rev=0x34
    vendor     = 'Intel Corporation'
    device     = 'Centrino Advanced-N 6205 [Taylor Peak]'
    class      = network

Throughput is down sharply for TCP file transfers (sftp) between it and a
local, wired system. Under 9.2-STABLE I was getting about 23 Mbps. With
10.0-rc5, I get about 11M. Testing also shows occasional, short circuit
drops, under half a second each.

Once in a while under 10.0-rc3 I would see the link drop and stay down.
restarting the interface (service netif restart restart) would restore the
link. I just upgraded to 10.0-rc5 this afternoon and have not seen the hang
to this point, but this only happened every couple of days.

I just noticed that the interface is running '11g' and not 'n'.
wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
    ether a0:88:b4:c6:ad:28
    inet netmask 0xffffff00 broadcast
    media: IEEE 802.11 Wireless Ethernet OFDM/48Mbps mode 11g
    status: associated
    ssid babcom channel 6 (2437 MHz 11g) bssid 00:26:b8:67:c3:2d
    country US authmode WPA2/802.11i privacy ON deftxkey UNDEF
    AES-CCM 2:128-bit txpower 15 bmiss 10 scanvalid 60 bgscan
    bgscanintvl 300 bgscanidle 250 roam:rssi 7 roam:rate 5 protmode CTS
    wme roaming MANUAL

Any idea of the problem or what information I could provide?
R. Kevin Oberman, Network Engineer, Retired
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