[Bug 579117] Re: Wireless blocks USB-Audio, leading to dropouts

[Chris Hermansen]

Ok I made them go away a bit.

Clicked on "disconnect" in NetworkManager.  ifconfig down on wlan0 and
eth0 interfaces, leaving only lo0.  Started up a terminal, nothing else
(save what Ubuntu starts up on its own).  Ran the same cyclictest as
above.

Here are the first few lines of the histogram, sorted in decreasing
order of hits:

# Histogram
107011 008137	
058011 007286	
036011 007205	
073011 005618	
047011 004095	
007011 004067	
071011 004026	
087011 003693	
107012 003457	
103011 003336	
032011 002941	
030011 002642	
038011 002626	
022011 002561	
075011 002515	
058012 002502	
006011 002399	
036012 002334	
051011 002294	

Conversely, here are the worst delays and their counts:

126012 000076	
126013 000027	
126014 000009	
126016 000005	
126017 000001	
126018 000002	
126020 000001	
126021 000002	
126022 000001	
126023 000001	
126027 000002	
126033 000001	
126057 000001	
126101 000001	
126221 000001	
126303 000001	
126353 000001	
126940 000001	
# Total: 000259446
# Max Latency: 126940 / 1000000

So, not sure what to think about this, 127ms still seems like a fairly
large latency.

Does this help - my laptop is a hmm five year old Toshiba with a dual-
core 3.2Ghz P-4 and 1Gb of memory, a 5400rpm 120Gb EIDE hard drive,
Phoenix BIOS.  Maybe a 127ms latency is "normal" on one of these babies!
Though it sounds like a big latency to me.

-- 
Wireless blocks USB-Audio, leading to dropouts
https://bugs.launchpad.net/bugs/579117
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