Re: [Xen-users] Xen IB

[Vivien Bernet-Rollande <vivien.bernet-rollande@xxxxxxxxxxxxxxxxx>]

> > I have been reading and found this "xen IB". What exactly is that? How do
> > i use it?
AFAIK, it wasn't merged into the tree, in part because it had severe 
security holes. It is based on an outdated tree, and I had a really hard 
time getting it to work.
The idea was to allow paravirtualising IB devices. Basically you had :
 - a PV driver that talked to the dom0 driver
 - the PV driver could be used to request UARs on the physical card, 
and map them into the domU's space
 - the domU could then use the UAR to send/recieve data straight 
through the infiniband card
IIRC support was limited to a rat


The performance critical path would go straight to the hardware, while 
the rest would go through Xen.
If you're trying to get IB to work in dom0, some will work out of the 
box, some won't.
See http://www.mail-archive.com/linux-rdma@xxxxxxxxxxxxxxx/msg06851.html

I didn't follow the latest evolutions, but new PCI handling code was 
supposed to fix the problem I encountered.
--
Vivien Bernet-Rollande
Systems&  Networking Engineer
Alter Way Hosting


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