From: John Clark <jclark@me...> - 2005-04-22 18:21:09
I cvs'd the as-of-20050421 BSD branch of madwifi. The resultant driver
do merging and seems to run for a 'long period of time'.
I have an experiemental setup consisting of 4 nodes, 3 of which have two
cards, and one has only one card. Each two card node is using channel 2
and channel 10
respectively. I've looked at a spectrum analyzer and it seems this has
'pretty' good channel
In a run over night with two 'netperf' tests in operation, on each of
the channels, I had some
rather different results. On one pair, the plot of the Mb/s seems to
have a fast kickoff value,
say 20 Mb/s, then shortly thereafter drops to about 10 Mbs. During the
run there were somewhat
'erratic' points dropping to 'very low', in sort of a random patter.
However, occasionally I'd see
a drop to about 5 Mb/s, but then after some period of time, the bit rate
would return to about
In the other pair, the kickoff bit rate was about 15 Mb/s, then dropped
to 10 Mb/s and finally
for a very long period until the end of the test, hovered around 5Mb/s.
There were also points
were the bit rate shot up to 10 Mb/s but these were random and infrequent.
From the spectrum analyzer, it would appear that the area I'm in is
pretty clean relative to other
2.4 Ghz signals, so unless there is some radar sweep in the middle of
the night, the burglers used
the Microwave, or similar, it is not clear to me why there's this
variation in the bit rate.
The iwconfig stats, don't seem to indicate horrendous errors either, on
the pair which had a consistenly
low bit rate over most of the test period, approx. 5 Mb/s, there have
been only 6 'excessive retries',
and 6 'invalid misc.' errors reported. This would definately not explain
the low bit rate.
The question to the readership, is 1) is anyone extensively testing
Ad-Hoc, 2) have similar behavior
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