Date: Fri, 26 Oct 2012 14:06:05 +0200 From: Johann Hugo <jhugo@meraka.csir.co.za> To: Adrian Chadd <adrian@freebsd.org>, freebsd-wireless@freebsd.org Subject: Re: 11n channel width Message-ID: <201210261406.05385.jhugo@meraka.csir.co.za> In-Reply-To: <CAJ-VmokrOzyb6NywGmf3bVaOVmXe0nJ3f8Ku2ZL-kzqyY8SfXw@mail.gmail.com> References: <201210221556.08616.jhugo@meraka.csir.co.za> <CAJ-VmokrOzyb6NywGmf3bVaOVmXe0nJ3f8Ku2ZL-kzqyY8SfXw@mail.gmail.com>
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On Monday 22 October 2012 16:09:50 you wrote:
> On 22 October 2012 06:56, Johann Hugo <jhugo@meraka.csir.co.za> wrote:
> > Hi
> >
> > What difference in throuput can one expect between ht/20 and a ht/40 ?
>
> If you're hitting best possible circumstances? Almost 2x.
>
Is this more or less the troughput what one should expect:
a/20 = 29.7 Mbits/sec
ht/20 = 40.6 Mbits/sec
ht/40 = 44.1 Mbits/sec
HW = gateworks ARM
OS = FreeBSD 10.0-CURRENT (from 2012/10/11)
Build = arm-10-20121011
Wifi = RouterBOARD R52nM = AR9220
*****************************************************************************
mesh-1d04:~ # ifconfig wlan1 channel 28:a/20
mesh-1d04:~ # ifconfig wlan1
wlan1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
ether 00:0c:42:6c:61:91
inet 10.50.50.1 netmask 0xffffff00 broadcast 10.50.50.255
inet6 fe80::20c:42ff:fe6c:6191%wlan1 prefixlen 64 scopeid 0x8
inet6 fde4:7b85:9218:10:20c:42ff:fe6c:6191 prefixlen 64
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
media: IEEE 802.11 Wireless Ethernet autoselect mode 11a <hostap>
status: running
ssid testAP channel 28 (5140 MHz 11a) bssid 00:0c:42:6c:61:91
regdomain NONE country ZA ecm authmode OPEN privacy OFF txpower 17
mcastrate 6 mgmtrate 6 scanvalid 60 wme burst dtimperiod 1 -dfs
mesh-1d04:~ # iperf -c 10.50.50.2
------------------------------------------------------------
Client connecting to 10.50.50.2, TCP port 5001
TCP window size: 32.5 KByte (default)
------------------------------------------------------------
[ 3] local 10.50.50.1 port 31219 connected with 10.50.50.2 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 35.5 MBytes 29.7 Mbits/sec
*****************************************************************************
mesh-1d04:~ # ifconfig wlan1 channel 28:a/20
mesh-1d04:~ # ifconfig wlan1
wlan1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
ether 00:0c:42:6c:61:91
inet 10.50.50.1 netmask 0xffffff00 broadcast 10.50.50.255
inet6 fe80::20c:42ff:fe6c:6191%wlan1 prefixlen 64 scopeid 0x8
inet6 fde4:7b85:9218:10:20c:42ff:fe6c:6191 prefixlen 64
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
media: IEEE 802.11 Wireless Ethernet autoselect mode 11na <hostap>
status: running
ssid testAP channel 28 (5140 MHz 11a ht/20) bssid 00:0c:42:6c:61:91
regdomain NONE country ZA ecm authmode OPEN privacy OFF txpower 17
mcastrate 6 mgmtrate 6 scanvalid 60 ampdulimit 64k ampdudensity 8
shortgi wme burst dtimperiod 1 -dfs
mesh-1d04:~ # iperf -c 10.50.50.2
------------------------------------------------------------
Client connecting to 10.50.50.2, TCP port 5001
TCP window size: 32.5 KByte (default)
------------------------------------------------------------
[ 3] local 10.50.50.1 port 53324 connected with 10.50.50.2 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.1 sec 48.8 MBytes 40.6 Mbits/sec
*****************************************************************************
mesh-1d04:~ # ifconfig wlan1 channel 28:ht/40
wlan1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
ether 00:0c:42:6c:61:91
inet 10.50.50.1 netmask 0xffffff00 broadcast 10.50.50.255
inet6 fe80::20c:42ff:fe6c:6191%wlan1 prefixlen 64 scopeid 0x8
inet6 fde4:7b85:9218:10:20c:42ff:fe6c:6191 prefixlen 64
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
media: IEEE 802.11 Wireless Ethernet autoselect mode 11na <hostap>
status: running
ssid testAP channel 28 (5140 MHz 11a ht/40-) bssid 00:0c:42:6c:61:91
regdomain NONE country ZA ecm authmode OPEN privacy OFF txpower 17
mcastrate 6 mgmtrate 6 scanvalid 60 ampdulimit 64k ampdudensity 8
shortgi wme burst dtimperiod 1 -dfs
mesh-1d04:~ # iperf -c 10.50.50.2
Client connecting to 10.50.50.2, TCP port 5001
TCP window size: 32.5 KByte (default)
------------------------------------------------------------
[ 3] local 10.50.50.1 port 26303 connected with 10.50.50.2 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.1 sec 52.9 MBytes 44.1 Mbits/sec
Johann
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