[Beowulf] Update on dealing with Spectre and Meltdown

[Ryan Novosielski]

I have been waiting, specifically, for Prentice Bisbal to try it. :-P

I actually have not checked to see whether any other upgrades I’ve applied have handled these vulnerabilities (I’d assume RedHat would have patched their distribution). FWIW, however, I did receive a report that one of our newer images seemed slower.  Haven’t gotten a chance to fully investigate those reports — could be any number of other things.

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||_// the State     |         Ryan Novosielski - novosirj at rutgers.edu<mailto:novosirj at rutgers.edu>
|| \\ University | Sr. Technologist - 973/972.0922 (2x0922) ~*~ RBHS Campus
||  \\    of NJ     | Office of Advanced Research Computing - MSB C630, Newark
    `'

On Mar 8, 2018, at 13:13, Alex Chekholko via Beowulf <beowulf at beowulf.org<mailto:beowulf at beowulf.org>> wrote:

As an experienced and cynical HPC admin working with trusted users... I have not installed any kind of firmware or kernel updates.  I'll wait for you to go first :)

On Thu, Mar 8, 2018 at 10:10 AM, Prentice Bisbal <pbisbal at pppl.gov<mailto:pbisbal at pppl.gov>> wrote:
Beowulfers,

Have any of you updated the kernels on your clusters to fix the Spectre and Meltdown vulnerabilities? I was following this issue closely for the first couple of weeks. There seemed to be a lack of consensus on how much these fixed would impact HPC jobs, and if I recall correctly, some of the patches really hurt performance, or caused other problems. We took a wait-and-see approach here. So now that I've waited a while, what did you see?

--
Prentice

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