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Re: [Xen-devel] Are there source codes for Xen-IB?

On Thu, May 26, 2011 at 03:10:40PM +0100, Ian Campbell wrote:
> On Thu, 2011-05-26 at 15:04 +0100, maus wrote:
> > Hi,
> >  
> > I know use IP-over-IB can let KVM or Xen use IB, but what I have to do
> > is like Xen-IB. Not just use IB.
> What is Xen-IB exactly?

OS and hypervisor bypass, i.e., direct access from a user application
running in a domU to the Infiniband adapter (HCA), bypassing both the
domU kernel and Xen for frequent data-path operations. Configuration
and privileged operations still go through the kernel and the

> > So, there is no toturial for Xen-IB,right?
> That's right, there is no documentation and anyone who would have
> been involved with this stuff is long gone.

Actually, there is a very nice paper describing the approach:

  "High Performance VMM-Bypass I/O in Virtual Machines", Jiuxing
  Liu, Wei Huang, Bulent Abali, Dhabaleswar K. Panda, USENIX ATC '06


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