tinc throughput on alix machines

[Mike Bentzen]

If you've turned on compression and set it high, it will have a big impact.
You might want to play with the compression settings.
High compression uses up more CPU and will be slower.

You could try turning compression off, but will probably result in more bandwidth being used.
But you might see a performance increase.

Mike


On 17/03/2010, at 10:36 AM, michael-dev wrote:

> Hi,
> 
> I've setup a wlan ap using a an alix 2d2 (AMD Geode LX 500 Mhz + AES
> Offload)
> and am now trying to encapsulate the wlan traffic into a vpn (tap bridge).
> Though even when disabling crypto and digest (there is a crypto engine
> onboard 
> can be setup to handle tinc encryption), the best throughput I get
> is aroung 2,9 MByte per second (wget+http) (even if the client is run
> locally).
> The network card and the source do support up to 11 MByte/s and when using
> tinc
> the cpu loads go into the limits, so I guess to just copying memory or
> calculating way too much.
> Looking at the source, it looks like there isn't much copying at all,
> the only place it wasn't clear to me why copying occurs is at the
> beginning in route_mac
> when source and destination mac are copying into local variables, though
> changing that does
> not gain a lot. Running gprof it reports no time spent but only function
> calls, which
> hints that all time is lost in the kernel.
> 
> Does somebody have any numbers around on what one could expect on a 500
> Mhz machine
> using tinc with/without encryption or on what to try out to improve
> throughput?
> 
> Thanks a lot,
> Michael Braun
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