[Beowulf] Fwd: RHEL7 kernel update for L1TF vulnerability breaks RDMA

[John Hearns]

That raises a good point. Someone was asking recently about RDAM
availability on AWS.
Other storage setups, eg SpectrumScale operate over RDMA
What is a sure-fire test for 'ís RDMA working"
I bet there is a simple utility and I will kick myself.. but worth asking.
On Tue, 11 Sep 2018 at 12:50, Michael Di Domenico
<mdidomenico4 at gmail.com> wrote:
>
> meant to send this to the list not just ryan
>
> ---------- Forwarded message ---------
> From: Michael Di Domenico <mdidomenico4 at gmail.com>
> Date: Tue, Sep 11, 2018 at 7:48 AM
> Subject: Re: [Beowulf] RHEL7 kernel update for L1TF vulnerability breaks RDMA
> To: <novosirj at rutgers.edu>
>
>
> On Mon, Sep 10, 2018 at 7:18 PM Ryan Novosielski <novosirj at rutgers.edu> wrote:
> > > On Sep 10, 2018, at 18:15, Chris Samuel <chris at csamuel.org> wrote:
> > >
> > >> So I guess I have to forgive the software engineer who fat-fingered that
> > >> semicolon. Of course I've done worse.
> > >
> > > Oh yes, same here too!   There but for... and all that. :-)
> >
> > So we’ve learned what, here, that RedHat doesn’t test the RDMA stack at all?
>
> i'm not sure the test path was that simple.  I updated my machines to
> the rhel 11.6 kernel.  i was able to use IPoIB but was not able to use
> Lustre.  so while the ultimate fix was a semi-colon, the failure code
> path i believe is/was more complicated.
>
> what this tells me is that there's probably more bugs in the IB stack
> then anyone thinks
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