[ath] Degraded throughput - adhoc mode

[Johann Hugo]

On Sunday, December 09, 2012 04:18:45 PM Adrian Chadd wrote:
> Ok, I've just taught the aggressive mode logic about IBSS. It's pretty
> dirty - I may cop some hate for enabling aggressive mode for IBSS as
> each IBSS node doesn't know about the overall voice/video data rates.
> That's how it works in AP mode - the AP tracks the traffic it is
> sending/receiving and changes its configuration based on that. It
> can't take into account overlapping BSSes.
> 
> In any case, can you just try that out in your lab and let me know how it
> goes?

Great, I'm now getting the same throughput for ADHOC and AP/STA mode.

mesh-2870:~ # uname -a
FreeBSD mesh-2870 10.0-CURRENT FreeBSD 10.0-CURRENT #15: Wed Dec 12 11:38:06

wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 00:02:6f:41:19:09
        inet6 fe80::202:6fff:fe41:1909%wlan0 prefixlen 64 scopeid 0x7 
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
        media: IEEE 802.11 Wireless Ethernet autoselect mode 11a <adhoc>
        status: running
        ssid mesh channel 128 (5640 MHz 11a) bssid 02:88:99:fe:ca:00
        regdomain NONE country ZA ecm authmode OPEN privacy OFF txpower 24
        mcastrate 6 mgmtrate 6 scanvalid 60 wme burst

mesh-2870:~ # ifconfig wlan0 list wme
        AC_BE cwmin  4 cwmax 10 aifs  3 txopLimit   0
        AC_BK cwmin  4 cwmax 10 aifs  7 txopLimit   0
        AC_VI cwmin  3 cwmax  4 aifs  2 txopLimit  94
        AC_VO cwmin  2 cwmax  3 aifs  2 txopLimit  47
mesh-2870:~ #  ifconfig wlan0 wme aifs be 2 cwmin be 4 cwmax be 10 txoplimit 
be 64

mesh-2870:~ # iperf -V -c fe80::202:6fff:fe41:1908%wlan0
------------------------------------------------------------
Client connecting to fe80::202:6fff:fe41:1908%wlan0, TCP port 5001
TCP window size: 40.1 KByte (default)
------------------------------------------------------------
[  3] local fe80::202:6fff:fe41:1909 port 60833 connected with 
fe80::202:6fff:fe41:1908 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  34.4 MBytes  28.8 Mbits/sec

mesh-2870:~ # iperf -V -c fe80::202:6fff:fe41:1908%wlan0
------------------------------------------------------------
Client connecting to fe80::202:6fff:fe41:1908%wlan0, TCP port 5001
TCP window size: 40.1 KByte (default)
------------------------------------------------------------
[  3] local fe80::202:6fff:fe41:1909 port 41099 connected with 
fe80::202:6fff:fe41:1908 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  34.6 MBytes  29.0 Mbits/sec

Did you manage to figure out why the wme setting changes back when the 
interface if taken down/up ?

Johann