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<p><font size="-1"><font face="Tahoma">Hi all,</font></font></p>
<p><font size="-1"><font face="Tahoma"><br>
</font></font></p>
<p><font size="-1"><font face="Tahoma">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.<br>
</font></font></p>
<p><font size="-1"><font face="Tahoma"><br>
</font></font></p>
<p><font size="-1"><font face="Tahoma">______<br>
Orlando<br>
</font></font></p>
<p><font size="-1"><font face="Tahoma"><br>
</font></font></p>
<p><font size="-1"><font face="Tahoma"></font></font><br>
</p>
<br>
<div class="moz-cite-prefix">On 09/01/2018 03:46,
<a class="moz-txt-link-abbreviated" href="mailto:Greg.Lehmann@csiro.au">Greg.Lehmann@csiro.au</a> wrote:<br>
</div>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"
lang="EN-US">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"
lang="EN-US"> <a class="moz-txt-link-abbreviated" href="mailto:gpfsug-discuss-bounces@spectrumscale.org">gpfsug-discuss-bounces@spectrumscale.org</a>
[<a class="moz-txt-link-freetext" href="mailto:gpfsug-discuss-bounces@spectrumscale.org">mailto:gpfsug-discuss-bounces@spectrumscale.org</a>]
<b>On Behalf Of </b>Peinkofer, Stephan<br>
<b>Sent:</b> Tuesday, 9 January 2018 7:11 AM<br>
<b>To:</b> gpfsug main discussion list
<a class="moz-txt-link-rfc2396E" href="mailto:gpfsug-discuss@spectrumscale.org"><gpfsug-discuss@spectrumscale.org></a><br>
<b>Subject:</b> Re: [gpfsug-discuss] Meltdown, Spectre,
and impacts on GPFS<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div id="divtagdefaultwrapper">
<p><span
style="font-family:"Calibri",sans-serif;color:black">Dear
List,<o:p></o:p></span></p>
<p><span
style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p><span
style="font-family:"Calibri",sans-serif;color:black">my
very personal experience today, using the patched kernel
for SLES 12.1 LTS (</span><span
style="font-size:13.0pt;font-family:"Courier
New";color:#0D2C40">3.12.74-60.64.69.1</span><span
style="font-family:"Calibri",sans-serif;color:black">)
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!? <o:p></o:p></span></p>
<p><span
style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p><span
style="font-family:"Calibri",sans-serif;color:black">mmfs.log
always showed something like this:<o:p></o:p></span></p>
<p><span
style="font-family:"Calibri",sans-serif;color:black">...<o:p></o:p></span></p>
<p><span
style="font-family:"Calibri",sans-serif;color:black">/usr/lpp/mmfs/bin/runmmfs[336]:
.[213]: loadKernelExt[674]: InsModWrapper[95]: eval: line
1: 3915: Memory fault<o:p></o:p></span></p>
<p><span
style="font-family:"Calibri",sans-serif;color:black">...<o:p></o:p></span></p>
<p><span
style="font-family:"Calibri",sans-serif;color:black">2018-01-08_09:01:27.520+0100
runmmfs: error in loading or unloading the mmfs kernel
extension<o:p></o:p></span></p>
<p><span
style="font-family:"Calibri",sans-serif;color:black">...<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black">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.
<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black">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.<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black">Many
thanks in advance.<br>
Best Regards, <o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black">Stephan
Peinkofer<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<div>
<div class="MsoNormal" style="text-align:center"
align="center"><span
style="font-family:"Calibri",sans-serif;color:black">
<hr size="3" align="center" width="98%">
</span></div>
<div id="divRplyFwdMsg">
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">
<a
href="mailto:gpfsug-discuss-bounces@spectrumscale.org"
moz-do-not-send="true">gpfsug-discuss-bounces@spectrumscale.org</a>
<<a
href="mailto:gpfsug-discuss-bounces@spectrumscale.org"
moz-do-not-send="true">gpfsug-discuss-bounces@spectrumscale.org</a>>
on behalf of Buterbaugh, Kevin L <<a
href="mailto:Kevin.Buterbaugh@Vanderbilt.Edu"
moz-do-not-send="true">Kevin.Buterbaugh@Vanderbilt.Edu</a>><br>
<b>Sent:</b> Monday, January 8, 2018 5:52 PM<br>
<b>To:</b> gpfsug main discussion list<br>
<b>Subject:</b> Re: [gpfsug-discuss] Meltdown,
Spectre, and impacts on GPFS</span><span
style="font-family:"Calibri",sans-serif;color:black">
<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black"> <o:p></o:p></span></p>
</div>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black">Hi
GPFS Team,
<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black">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).<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black">Thanks
again…<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black">Kevin<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black"><br>
<br>
<o:p></o:p></span></p>
<blockquote
style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black">On
Jan 4, 2018, at 4:55 PM, IBM Spectrum
Scale <<a
href="mailto:scale@us.ibm.com"
moz-do-not-send="true">scale@us.ibm.com</a>>
wrote:<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black">Kevin,</span><span
style="font-family:"Calibri",sans-serif;color:black"><br>
<br>
</span><span
style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black">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.</span><span
style="font-family:"Calibri",sans-serif;color:black"><br>
<br>
</span><span
style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black">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. </span><span
style="font-family:"Calibri",sans-serif;color:black"><br>
<br>
<br>
<br>
</span><span
style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black">Regards,
The Spectrum Scale (GPFS) team<br>
<br>
------------------------------------------------------------------------------------------------------------------<br>
If you feel that your question can
benefit other users of Spectrum Scale
(GPFS), then please post it to the
public IBM developerWroks Forum at
<a
href="https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ibm.com%2Fdeveloperworks%2Fcommunity%2Fforums%2Fhtml%2Fforum%3Fid%3D11111111-0000-0000-0000-000000000479&data=02%7C01%7CKevin.Buterbaugh%40vanderbilt.edu%7C78bfa7bc56e6403dfa2008d553e510e7%7Cba5a7f39e3be4ab3b45067fa80faecad%7C0%7C0%7C636507165938314209&sdata=D%2BormYVXAwlnskLb525U2nuaUXncu5Wgt98V6U4xBZc%3D&reserved=0"
moz-do-not-send="true">
https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000000479</a>.
<br>
<br>
If your query concerns a potential
software error in Spectrum Scale (GPFS)
and you have an IBM software maintenance
contract please contact 1-800-237-5511
in the United States or your local IBM
Service Center in other countries.
<br>
<br>
The forum is informally monitored as
time permits and should not be used for
priority messages to the Spectrum Scale
(GPFS) team.</span><span
style="font-family:"Calibri",sans-serif;color:black"><br>
<br>
<graycol.gif></span><span
style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#424282">"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</span><span
style="font-family:"Calibri",sans-serif;color:black"><br>
<br>
</span><span
style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#5F5F5F">From:
</span><span
style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black">"Buterbaugh,
Kevin L" <<a
href="mailto:Kevin.Buterbaugh@Vanderbilt.Edu"
moz-do-not-send="true">Kevin.Buterbaugh@Vanderbilt.Edu</a>></span><span
style="font-family:"Calibri",sans-serif;color:black"><br>
</span><span
style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#5F5F5F">To:
</span><span
style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black">gpfsug
main discussion list <<a
href="mailto:gpfsug-discuss@spectrumscale.org"
moz-do-not-send="true">gpfsug-discuss@spectrumscale.org</a>></span><span
style="font-family:"Calibri",sans-serif;color:black"><br>
</span><span
style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#5F5F5F">Date:
</span><span
style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black">01/04/2018
01:11 PM</span><span
style="font-family:"Calibri",sans-serif;color:black"><br>
</span><span
style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#5F5F5F">Subject:
</span><span
style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black">[gpfsug-discuss]
Meltdown, Spectre, and impacts on GPFS</span><span
style="font-family:"Calibri",sans-serif;color:black"><br>
</span><span
style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#5F5F5F">Sent
by:
</span><span
style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black"><a
href="mailto:gpfsug-discuss-bounces@spectrumscale.org"
moz-do-not-send="true">gpfsug-discuss-bounces@spectrumscale.org</a></span><span
style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
<div class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black">
<hr style="color:#8091A5" size="2"
align="left" noshade="noshade"
width="100%">
</span></div>
<p class="MsoNormal"
style="margin-bottom:12.0pt"><span
style="font-family:"Calibri",sans-serif;color:black"><br>
<br>
<br>
Happy New Year everyone, <br>
<br>
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.<br>
<br>
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?<br>
<br>
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.<br>
<br>
Thanks…<br>
<br>
Kevin<br>
<br>
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<br>
<br>
—<br>
Kevin Buterbaugh - Senior System
Administrator<br>
Vanderbilt University - Advanced
Computing Center for Research and
Education<br>
<a
href="mailto:Kevin.Buterbaugh@vanderbilt.edu"
moz-do-not-send="true">Kevin.Buterbaugh@vanderbilt.edu</a>
- (615)875-9633<o:p></o:p></span></p>
</div>
</div>
</blockquote>
</div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
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</pre>
</blockquote>
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