[Beowulf] RHEL7 kernel update for L1TF vulnerability breaks RDMA

[Jörg Saßmannshausen]

Hi Ade,

thanks for this. I will give it a spin.

So far I only done a simple ping-pong test but never done a RDMA test.

All the best and thanks!

Jörg

Am Dienstag, 2. Oktober 2018, 21:33:09 BST schrieb 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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