We are attempting to stress a wireless link and monitor the performance of the
802.11 protocol. We have one unit under test as a client that reports an
interval bandwidth close to ??M while the server is reporting much lower
bandwidths in each interval with high UDP packet loss. The wireshark data
indicates significant 802.11 packet loss.
A different client (PC) reports a bandwidth at each interval similar to the
server report for the respective interval and the server does not report high
UDP packet loss. The wireshark captures illustrate a similar effort of 802.11
retries retrying more times on a particular sequence frame resulting in lower
drops.
On the PC client, the client summary report for bandwidth is close to but never
matches the server report even accounting for packet loss.
We are confused about the inner workings of iperf which raises questions of the
validity of the reports under these conditions.
1. Does the iperf client measure the interval bandwidth by the amount of
data it wrote do a buffer per interval or by the amount of data the radio
pulled out of the buffer per interval or the amount of data the radio put on
the air? The first two should be equivalent.
2. The other question I should ask but cannot think of.
Thanks in advance for any assistance you can provide.
------------------------------------------------------------------------------
The Go Parallel Website, sponsored by Intel - in partnership with Geeknet,
is your hub for all things parallel software development, from weekly thought
leadership blogs to news, videos, case studies, tutorials, tech docs,
whitepapers, evaluation guides, and opinion stories. Check out the most
recent posts - join the conversation now. http://goparallel.sourceforge.net/
_______________________________________________
Iperf-users mailing list
Iperf-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/iperf-users
