[rt2x00-users] Strange latency in latest version rt2800usb.
blaise at willowgarage.com
Thu Nov 11 20:27:02 UTC 2010
I have been playing around some more with the latest version of the
rt2800usb driver, and have noticed that the terminals I am working
with seem to freeze from time to time. Digging deeper, it appears that
the freezes happen when doing an ifconfig down, and when doing an
associate, but not every time.
I have seen the freezes in the two contexts I have tried:
- Over an ssh connection via the wired network. I run "while true; do
sleep 0.1; date "+%s"; sleep 0.1; echo; done", and observe ~2 second
pauses in the display. After the pause, there are no missing dates, so
the while loop was running all along.
- At the text console. I have not seen any freezes of the output of my
while loop. On the other hand, I have seen cases where keyboard
presses get delayed for a couple of seconds.
During the freezes, udpmoncli seems to be able to continue working
happily, and sees no packet loss, so UDP networking seems to be doing
I was wondering if you have any idea what could be causing these
freezes. Is there a possibility that rt2800usb is spinning for a while
and holding up certain tasks?
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