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

[maus <maustudent@xxxxxxxxx>]

The Xen-IB I said means VMM-bypass I/O virtualization of InfiniBand on Xen.
At the beginning, the link:  http://xenbits.xensource.com/ext/xen-smartio.hg I found is for that.
However, it looks like Xen-IB(as I said in first line) doesn't exist and no one would know how to build up it, right?


Yi-Man

2011/5/26 Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>

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?

> 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.

Ian.

>
>
> Yi-Man
>
>
>
> 2011/5/26 Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>
>         On Wed, 2011-05-25 at 14:40 +0100, maus wrote:
>         > Hi,
>         >
>         > I have a project which is make KVM use InfiniBand.
>         > However, since Xen can use InfiniBand through Xen-IB, I want
>         to try to
>         > make Xen use InfiniBand first.
>         > Through that way, I think it may give me some idea about how
>         to make
>         > KVM use InfiniBand.
>         > So, as you said, I just use "Updated defconfig to include
>         infiniband
>         > driver as modules for dom0/domU" to do?
>         > And since I don't know how to I do first for Xen-IB, is
>         there any
>         > tutorial for Xen-IB?
>         > Or does Xen build-in support IB currently?
>
>
>         I'm not sure what IB support you expect Xen to have over and
>         above the
>         driver and utils support, which are functions of the dom0
>         kernel and
>         distro and not the hypervisor.
>
>         Have you got IB working on a native system? I expect that if
>         you do that
>         then Xen or KVM will be able to make use of it basically for
>         free, i.e.
>         configure a VIF on an IP-over-IB bridge or use a local
>         IP-over-IB
>         address in dom0 for migration etc etc.
>
>         Ian.
>
>
>         >
>         > Yi-Man
>         >
>         >
>         >
>         > 2011/5/24 Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>
>         >         Please do not top post.
>         >
>         >         On Tue, 2011-05-24 at 11:07 +0100, maus wrote:
>         >         > Hi,
>         >         >
>         >         > There many file in
>         >          http://xenbits.xensource.com/ext/xen-smartio/ ,
>         >         > which should I use for Xen-IB?
>         >         > Use the following three?
>         >         > Updated defconfig to include infiniband driver as
>         modules
>         >         for
>         >         > dom0/domU
>         >         > Updating drivers/infiniband to latest. Should
>         shrink size of
>         >         > xen_ib.patch in
>         >         > Add support for Infiniband into Xen
>         >
>         >
>         >         Again, these changesets are >5 years old and have
>         not been
>         >         looked at or
>         >         maintained since -- I am very sceptical that you
>         will find
>         >         anything of
>         >         use on a modern Xen system in there.
>         >
>         >         I expect that IB support in the kernels we currently
>         use for
>         >         dom0 is
>         >         vastly improved over what was available in the
>         2.6.16 tree
>         >         referenced in
>         >         the above repository. Perhaps you don't even need
>         anything
>         >         special
>         >         outside of what is available in the upstream dom0
>         kernel.
>         >
>         >         Perhaps if you explain what you are actually trying
>         to achieve
>         >         then
>         >         people will be able to better advise you?
>         >
>         >         Ian.
>         >
>         >
>         >
>
>
>
>

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