Hi all,
If it helps - 4.2.3-6 compiles and starts fine on the RHEL 7.4 patched
kernel: 3.10.0-693.11.6.el7.x86_64.
______
Orlando
On 09/01/2018 03:46, [email protected] wrote:
This had me wondering, so I tried SLES 12 SP3 and thankfully GPFS v5
still runs after the kernel patch and an mmbuildgpl. It was just a
test box I had at the time, so I don’t have any comments on performance.
*From:*[email protected]
[mailto:[email protected]] *On Behalf Of
*Peinkofer, Stephan
*Sent:* Tuesday, 9 January 2018 7:11 AM
*To:* gpfsug main discussion list <[email protected]>
*Subject:* Re: [gpfsug-discuss] Meltdown, Spectre, and impacts on GPFS
Dear List,
my very personal experience today, using the patched kernel for SLES
12.1 LTS (3.12.74-60.64.69.1) on one single VM, was that GPFS
(4.2.3-4) did not even start (the kernel modules seemed to compile
fine using mmbuildgpl). Interestingly, even when I disabled PTI
explicitely, using the nopti kernel option, GPFS refused to start with
the same error!?
mmfs.log always showed something like this:
...
/usr/lpp/mmfs/bin/runmmfs[336]: .[213]: loadKernelExt[674]:
InsModWrapper[95]: eval: line 1: 3915: Memory fault
...
2018-01-08_09:01:27.520+0100 runmmfs: error in loading or unloading
the mmfs kernel extension
...
Since I had no time to investigate the issue further and raise a
ticket right now, I just downgraded to the previous kernel and
everything worked again.
As we have to patch at least the login nodes of our HPC clusters asap,
I would also appreciate if we could get a statement from IBM how the
KPTI patches are expected to interact with GPFS and if there are any
(general) problems, when we can expect updated GPFS packages.
Many thanks in advance.
Best Regards,
Stephan Peinkofer
------------------------------------------------------------------------
*From:*[email protected]
<mailto:[email protected]>
<[email protected]
<mailto:[email protected]>> on behalf of
Buterbaugh, Kevin L <[email protected]
<mailto:[email protected]>>
*Sent:* Monday, January 8, 2018 5:52 PM
*To:* gpfsug main discussion list
*Subject:* Re: [gpfsug-discuss] Meltdown, Spectre, and impacts on GPFS
Hi GPFS Team,
Thanks for this response. If it is at all possible I know that we
(and I would suspect many others are in this same boat) would greatly
appreciate a update from IBM on how a patched kernel impacts GPFS
functionality. Yes, we’d love to know the performance impact of the
patches on GPFS, but that pales in significance to knowing whether
GPFS version 4.x.x.x will even *start* with the patched kernel(s).
Thanks again…
Kevin
On Jan 4, 2018, at 4:55 PM, IBM Spectrum Scale <[email protected]
<mailto:[email protected]>> wrote:
Kevin,
The team is aware of Meltdown and Spectre. Due to the late
availability of production-ready test patches (they became
available today) we started today working on evaluating the impact
of applying these patches. The focus would be both on any
potential functional impacts (especially to the kernel modules
shipped with GPFS) and on the performance degradation which
affects user/kernel mode transitions. Performance characterization
will be complex, as some system calls which may get invoked often
by the mmfsd daemon will suddenly become significantly more
expensive because of the kernel changes. Depending on the main
areas affected, code changes might be possible to alleviate the
impact, by reducing frequency of certain calls, etc. Any such
changes will be deployed over time.
At this point, we can't say what impact this will have on
stability or Performance on systems running GPFS — until IBM
issues an official statement on this topic. We hope to have some
basic answers soon.
Regards, The Spectrum Scale (GPFS) team
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<graycol.gif>"Buterbaugh, Kevin L" ---01/04/2018 01:11:59
PM---Happy New Year everyone, I’m sure that everyone is aware of
Meltdown and Spectre by now … we, like m
From: "Buterbaugh, Kevin L" <[email protected]
<mailto:[email protected]>>
To: gpfsug main discussion list <[email protected]
<mailto:[email protected]>>
Date: 01/04/2018 01:11 PM
Subject: [gpfsug-discuss] Meltdown, Spectre, and impacts on GPFS
Sent by: [email protected]
<mailto:[email protected]>
------------------------------------------------------------------------
Happy New Year everyone,
I’m sure that everyone is aware of Meltdown and Spectre by now …
we, like many other institutions, will be patching for it at the
earliest possible opportunity.
Our understanding is that the most serious of the negative
performance impacts of these patches will be for things like I/O
(disk / network) … given that, we are curious if IBM has any plans
for a GPFS update that could help mitigate those impacts? Or is
there simply nothing that can be done?
If there is a GPFS update planned for this we’d be interested in
knowing so that we could coordinate the kernel and GPFS upgrades
on our cluster.
Thanks…
Kevin
P.S. The “Happy New Year” wasn’t intended as sarcasm … I hope it
is a good year for everyone despite how it’s starting out. :-O
—
Kevin Buterbaugh - Senior System Administrator
Vanderbilt University - Advanced Computing Center for Research and
Education
[email protected]
<mailto:[email protected]> - (615)875-9633
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07930742808|[email protected] <mailto:[email protected]>
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