[Beowulf] Update on dealing with Spectre and Meltdown

[Ryan Novosielski]

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Cheers, Gavin (hope you're well, BTW)!

Any real-world ballpark figures on how "killed" performance is (and
does your site disable those patches)?

On 03/08/2018 02:36 PM, Gavin W. Burris wrote:
> Just had our biannual maintenance window.  All the things are 
> patched.  One could disable the performance-killing patches with 
> the "noibrs noibpb nopti" grub options.  Cheers.
> 
> On Thu 03/08/18 01:55PM EST, Ryan Novosielski wrote:
>> 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.
>> 
>> -- ____ || \\UTGERS, 
>> |---------------------------*O*--------------------------- ||_//
>>  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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- -- 
 ____
 || \\UTGERS,     |----------------------*O*------------------------
 ||_// the State  |    Ryan Novosielski - novosirj at rutgers.edu
 || \\ University | Sr. Technologist - 973/972.0922 ~*~ RBHS Campus
 ||  \\    of NJ  | Office of Advanced Res. Comp. - MSB C630, Newark
      `'
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