ath 802.11g throughput in 6.2-RELEASE

[Kernel Jake]

Since upgrading to 6.2-RELEASE from 6.0-RC1, I have seen lower ath0 network 
throughput than I had previously.  I can't remember exactly what speeds I 
had prior to 6.2, but they were definitely greater than 11 Mbps, probably 
closer to 48 Mbps.

When I used my old 6.0-RC1 kernel config file with 6.2-RELEASE, it contained 
"device ath_rate_onoe", and the speed was between 1 and 5 Mbps .  I then 
noticed that the 6.2 ath man page listed "device ath_rate_sample", so I 
changed my config to use "sample" instead of "onoe", and now I get around 11 
Mbps.  But it still isn't as fast as it used to be.  Nothing changed in my 
environment other than my client (meaning physical layout, wireless channel, 
wap firmware, etc).

WAP: D-Link WRT54G ver.4, Firmware version 4.71.1 Hyperwrt 2.1b1 + Thibor15c
NIC: D-Link DWL-G520 Rev.B3

% uname -a
FreeBSD canary 6.2-RELEASE-p3 FreeBSD 6.2-RELEASE-p3 #0: Mon May 14 22:14:35 
CDT 2007     jake at canary:/usr/src/sys/i386/compile/CANARY  i386

% dmesg | grep ath
ath_hal: 0.9.17.2 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413, RF5413)
ath0: <Atheros 5212> mem 0xeb000000-0xeb00ffff irq 17 at device 14.0 on pci0
ath0: Ethernet address: 00:11:95:92:72:55
ath0: mac 7.9 phy 4.5 radio 5.6

% ifconfig ath0
ath0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet 192.168.1.55 netmask 0xffffff00 broadcast 192.168.1.255
        inet 192.168.1.54 netmask 0xffffffff broadcast 192.168.1.54
        ether 00:11:95:92:72:55
        media: IEEE 802.11 Wireless Ethernet autoselect mode 11g (DS/11Mbps)
        status: associated
        ssid yagi channel 2 bssid 00:14:bf:27:f1:bc
        authmode WPA privacy ON deftxkey UNDEF TKIP 2:128-bit TKIP 3:128-bit
        txpowmax 36 bmiss 7 protmode OFF burst roaming MANUAL bintval 100

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