[Voyage-linux] Extreme asymmetry/poor throughput on link

[Edwin Whitelaw]

Jan,

Thanks for the suggestion.  This is about as clear as it gets so am 
pretty sure it's not LOS/fresnel.  I can possibly move one end point 
around a little to see.  The other is on a water tank.  Kind of hard to 
move.  :-)

I had read somewhere that some of the early ALIX boards had some 
problems with two cards but can't find that reference now.  Pascal 
Dornier has sent out a change notice to add one capacitor to the 3Cs for 
handling high power cards and this board does not (yet) have that 
added.  Not sure what the behavior I should observe if there is a power 
supply problem.  I'd expect something like rebooting or lockups but so 
far the board has been very stable.  I even did and ifdown on the card 
that wasn't part of the tested link.  Does that reduce it's power 
drain?  I'd think so but don't know by how much.

Too cold for the next couple of days to climb the tank but my next 
iteration is to replace the ALIX with a WRAP.

Edwin

Jan Hetges wrote:
> On Thu, Feb 28, 2008 at 12:54:04PM -0500, Edwin Whitelaw wrote:
> [..snip..]
>   
>> The link in question is showing extreme asymmetry on iperf tests with as  
>> much as 40mbs going one way but rarely even 2mbs, and sometimes even  
>> <1mbs, the other way.
>>     
> [..snip..]
>   
>> Has anyone experienced this and/or can someone suggest what aspect of  
>> the link might at fault? radios? ALIX board? settings? interference?
>>     
>
> what about obstacle in LOS/fresnel zone ? 
> on these kind of assymetric link i normally have a tree/branch into LOS/
> fresnel zone close to the end where a lot of bandwith reaches, but not
> leaves!
>
> cheers
>
>   --Jan
>
>   
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-- 
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Edwin Whitelaw, P.E.
New River Valley Unwired, LLC
2200 Lonesome Dove Dr
Christiansburg, VA 24073
540-239-0318