Out of the dark i would say the SFP+ modules will cost twice the price compared to PCIe cards and you still have the risk of having nothing.
Trying to find a PCIe network card capable of 2.5GBps SFP+ might be simpler. Connection could then be tried with any of the already available fibre modules or with a SFP link cable.
In the end we won’t know if any of this works as expected until someone takes the risk of losing some money and having some hard time with configuration and kernel development.
[details=My way and off topic]I may go the fibre route and try with some modules. Seems the simplest way as network cards with Linux drivers should be available and SFP+ fibre modules work also on 4GBps Fibre Channel.
Nothing will happen in the near future as there are other things to do:
- Wait for my Omnia
- Port ArchLinuxARM to my Omnia
- Find some missing (NDA-only) information about the Marvell SoC in Omnia
- Build my Omnia extensions hardware (GPS,PPS,…)
- Install and setup FreeSwitch
- Get home automation running
- Tons of things not related to Omnia…
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There is zero overhead. USB3 cables are used because they are cheap and work.