[Beowulf] RHEL7 kernel update for L1TF vulnerability breaks RDMA

[Ade Fewings]

Hello from Wales

Red Hat quoted just a simple ib_write_bw test as indicating the broken state of IB RDMA (https://access.redhat.com/solutions/3568891):

    Run a RDMA write bandwidth test. ib_write_bw is provided by the package perftest.

    On target node run :
    # ib_write_bw

    On client side run :
    # ib_write_bw <target-IP>

    The test should fail.

Hope that helps
Ade



-----Original Message-----
From: Beowulf <beowulf-bounces at beowulf.org> On Behalf Of Jörg Saßmannshausen
Sent: 02 October 2018 22:20
To: beowulf at beowulf.org
Subject: Re: [Beowulf] RHEL7 kernel update for L1TF vulnerability breaks RDMA

Dear all,

is there some kind of quick test to demonstrate the patch does have or does not cause a problem with RDMA? I have been asked to look into that but I don't really want to use a large cp2k calculation which, I believe, makes use of RDMA.

All the best from London

Jörg

Am Mittwoch, 12. September 2018, 18:02:06 BST schrieb John Hearns via Beowulf:
> Regarding CentOS, Karanbir Singh is the leader of the project and has
> a job at Redhat
> https://www.linuxfoundation.org/blog/2014/01/centos-project-leader-kar
> anbir-> singh-opens-up-on-red-hat-deal/ On Tue, 11 Sep 2018 at 18:03,
> Peter St. John <peter.st.john at gmail.com>
wrote:
> > I mean the RH QA that tests RH products isn't the same team as tests
> > (or
> > not) CentOS, but I only know from the wiki that RH has an expanding
> > agreement with CentOS so may be this is all merging. As I said, my
> > buddy doesn't work in this area, and I sure don't. Probably all you
> > guys are more up to date on the merging than either of us.> On Tue,
> > Sep 11, 2018 at 12:50 PM, Peter Kjellström <cap at nsc.liu.se> wrote:
> >> On Tue, 11 Sep 2018 12:37:18 -0400
> >>
> >> "Peter St. John" <peter.st.john at gmail.com> wrote:
> >> > A friend at RH (who works in a different area) tells me RH does
> >> > not themselves test the downstream CentOS.
> >> > Peter
> >>
> >> That isn't surprising is it? But in this case we're talking about
> >> them not testing their own product.. :-D
> >>
> >> /Peter K
> >>
> >>
> >> --
> >> Sent from my Android device with K-9 Mail. Please excuse my brevity.
> >
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