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

[Soteris Markou]

Hi I am also experiencing the same problem. What I have noticed is that this only happens on hosts which act as masters and with vtun running. 
>From a search I did in the net it seems to be some sort of a packet storm which utilizes the CPU hence dropping the units performance. 

Even though this threat http://marc.info/?l=keepalived-devel&m=114040573028656&w=2 claims to resolve the issue I do not have the access to sourgeforge to see the mentioned script. 

Hope that helps

Regards
Soteris

> Date: Sun, 22 Feb 2009 12:05:28 -0500
> From: Edwin.Whitelaw at nrvunwired.net
> To: knife at toaster.net
> Subject: Re: [Voyage-linux] Performance issue w/ALIX and 2 radios
> CC: Voyage-linux at voyage.hk
> 
> 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
> >   
> 
> -- 
> <=+=+=+==+=+=+==+=+=+=+=+=+=+=+=>
> Edwin Whitelaw, P.E.
> New River Valley Unwired, LLC
> 2200 Lonesome Dove Dr
> Christiansburg, VA 24073
> 540-239-0318
> 
> 
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