Open Stack

Hi,

I was thinking about the exactly the same thing which Catlin pointed out.

Also, there is an implementation enabling RDMA handling from python:
  https://github.com/jgunthorpe/python-rdma
Thus, I was wondring if I can do something more using the above.


BTW, I'm in Boston attending at OpenStack Design Summit/Conference,
are any of you in Boston? > Catelin, Narayan, Nick


-Masanori

From: "Caitlin Bestler" <Caitlin.Bestler at nexenta.com>
Subject: Re: [Openstack] OpenStack + RDMA + Infiniband
Date: Mon, 3 Oct 2011 14:21:23 -0700

> 
> 
> Narayan Desai wrote:
> 
> 
> > I suspect that the original poster was looking for instance access
> (mediated in some way) to IB gear.
> > When we were trying to figure out how to best use our IB gear inside
> of openstack, we decided that
> > it was too risky to try exposing IB at the verbs layer to instances
> directly, since the security model
> > doesn't appear to have a good way to prevent administrative commands
> from being issued from
> > untrusted instances.
> 
> > We decided to use to IB as fast plumbing for data movement (using
> IPoIB) and have ended up with
> > pretty nice I/O performance to the volume service, etc. We haven't
> managed to use it for much more
> > than that at this point.
> 
> There's no reason to expect use of IPoIB to end up providing better
> TCP/IP service for large bulk data
> transfer than you would get from a quality Ethernet NIC. But if you have
> an existing IB infrastructure
> it is certainly worth considering. You should experiment to see whether
> you get better performance
> under load form IPoIB in connected mode as opposed to trying SDP.
> 
> Either IPoIB or SDP should be accessible via a standard sockets
> interface,meaning they could be
> plugged in without modifying the Python code or Python libraries.
> 
> The response to congestion by an IB network is different than the
> response from a TCP network,
> and the response of a TCP network simulated over IPoIB is something else
> entirely. So you'd want
> to do your evaluation with realistic traffic patterns.
> 
> 
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