#440: Wireless connection pauses / disconnects on ubuntu / Suse / Mandrake
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Reporter: anonymous | Owner: kelmo
Type: defect | Status: assigned
Priority: major | Milestone: version 0.9.x - progressive
release candidate phase
Component: madwifi: other | Version: trunk
Resolution: | Keywords: atheros disconnect
Patch_attached: 0 |
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Comment (by p0g0):
This may not relate, but I have observed a periodic dropout too.
The gear under test is a repeater array of WRAPS. They are all running
voyage (kernel 2.6.15) on CM9 radios in the A band in AHDEMO mode.
Bgscan is off, diversity is off, and a single antenna has been selected
for send and receive. This mode has no beacons, scanning, and all BSSIDs
are 0, so there is no association, and all it does is dump data on a given
channel. The receiver can ask for a packet to be resent, like on TP/TB
cabling, but that's it. Because it is ADEMO mode, I'd guess that none of
the dropouts are due to association/reassociation.
In a 3 WRAP array, the first and last WRAPs have OpenVPN running, and they
create a tunnel that moved encrypted data from the eth0 on WRAP1 to eth0
on WRAP3.
During iperf runs from workstations at the two eth0 nodes described above,
running top shows the cpu usage hitting 30-40% on the WRAPs running
OpenVPN.
Watching top on all three wraps during long (>20 second) shows the cpu
usage on WRAPs 1 & 3 in synchrony, and that at something like 20-30 second
intervals, the cpu usage falls to that of a WRAP not running OpenVPN. I
think this is the tunnel traffic stopping, and that is reinforced by a
simultaneous stutter/delay on the ssh session showing top that is linked
to WRAP2 via the radio link from WRAP3- if the links quit, then I would
expect the WRAP2 top screen to not refresh on the 3 second interval it
normally does, and that is just what I see.
It appears that having other cpu activity on the WRAPS, like a ping
session from WRAP2 to WRAP3, or the SSH session reduces the frequency and
the duration of the dropouts.
--
Ticket URL: <http://madwifi.org/ticket/440>
MadWifi <http://madwifi.org/>
Multiband Atheros Driver for Wireless Fidelity
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