[Voyage-linux] Performance issue w/ALIX and 2 radios

[Edwin Whitelaw]

Sean,

Thanks for the thoughts.  While noise is possible, the radios are 5.2 
and 5.8 bands respectively and 5Ghz is non-overlapping as well so I 
wouldn't think the effect would be this dramatic.  I've run 2 2.4GHz 
cards in a common box and did see some throughput effect but nothing 
like I've reported here.  The cpu load doesn't go up much though the 
ksoftirqd does consume a fair number of cycles.  I also  wonder whether 
the board's design is a factor wrt to the minipci bus, hence the 
posting.  Another possible explanation is the driver in handling the 
interrupts/dma transfers on the bus.

I have a 3 ethernet port ALIX that I will test this on using only the 
wired interfaces to rule out/in anything to do with madwifi, hal, 
atheros chipset, etc.

Edwin

Sean wrote:
> It could be radio noise in the box, even though you may be using different channels.
> It could also be cpu. What percentage does your cpu get up to in top while running the tests? It would also be good to find out how much the minipci backplane in the alix will support.
>
> Sean
>   

-- 
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Edwin Whitelaw, P.E.
New River Valley Unwired, LLC
2200 Lonesome Dove Dr
Christiansburg, VA 24073
540-239-0318