Oh, I made a mistake. Actually, I use the 802.11g protocol and i set the udp
bandwidth=54M . But the results is only 13Mbps and I don't know why the result
is so low.
I think the "iwconfig wlan0 rate 1M " command works because when i check
"iwconfig wlan0" the rate turns to 1M. And when i turn off the wlan0 the iperf
result becomes to 0.
--- 11年3月29日，周二, Olivier Mehani <shtrom-ip...@ssji.net> 写道：
发件人: Olivier Mehani <shtrom-ip...@ssji.net>
主题: Re: [Iperf-users] Bandwidth Question in Iperf
收件人: "清 廖" <liaoqin...@yahoo.com.cn>
抄送: iperf-users@lists.sourceforge.net, "Xiaojun Feng" <fight...@gmail.com>
日期: 2011年3月29日,周二,上午10:27
On Tue, Mar 29, 2011 at 12:14:18AM +0800, 清 廖 wrote:
> I use two PCs and one router to establish a 802.11b network in my lab.
Afaik, 802.11b is limited to 11Mbps (b, not B).
> And I let a client use 54M udp bandwidth(-b 54M) to send data to
> another pc through router. But the result is only 13MBytes/sec.
I noticed in the past that the order of the option matters for Iperf to
take it into account or not. However, I find it surprising that you even
get 13MBps, that is 104Mbps on a physical network theoretically limited
to 11Mbps, not taking encapsulation into account. Are you sure you're
using 802.11b rather than g (54Mbps, so it's not consistent with your
results either) or more recent amendments.
> Furthermore, I use "iwconfig wlan0 rate 1M" to set the client wireless
> adapter rate. But the result of iperf is not be influenced by this
> command.
This would limit the 802.11 rate to 1Mbps, if the driver is compliant.
Are you sure your traffic goes over the right interface?
> Could anyone tell me how to let the iperf result reach to the 54M,
> because the interference between two pc is not large through the
> spectrum analyzer examination.
Well, you should first make sure you now what you are dealing with
precisely. Also know in what the units are. Bytes are 8 bits long.
--
Olivier Mehani <sht...@ssji.net>
PGP fingerprint: 4435 CF6A 7C8D DD9B E2DE F5F9 F012 A6E2 98C6 6655
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