Thanks again, Gavin. We did the same thing at our site this week (mitigated on login nodes, disabled mitigation on compute nodes), but I intend to go back and test to see if there’s any performance penalty without the kernel arguments.
Am I correct that this is Haswell and newer that is affected? -- ____ || \\UTGERS, |---------------------------*O*--------------------------- ||_// the State | Ryan Novosielski - novos...@rutgers.edu<mailto:novos...@rutgers.edu> || \\ University | Sr. Technologist - 973/972.0922 (2x0922) ~*~ RBHS Campus || \\ of NJ | Office of Advanced Research Computing - MSB C630, Newark `' On Mar 9, 2018, at 10:06, Gavin W. Burris <b...@wharton.upenn.edu<mailto:b...@wharton.upenn.edu>> wrote: Hey, Ryan. Doing well. Hope you weathered the storm OK! The benchmarks were inconclusive, as they were ran on a loaded system. I should have ran a variety during the maintenance window, when queues were clear. With so many different applications, many of which being network IO-bound, we decided to only enforce patches on login nodes, applying grub options on compute nodes. Numbers there are good. Cheers. On Thu 03/08/18 02:47PM EST, Ryan Novosielski wrote: 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 - novos...@rutgers.edu<mailto:novos...@rutgers.edu><mailto:novos...@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@beowulf.org<mailto:beowulf@beowulf.org><mailto:beowulf@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 <pbis...@pppl.gov<mailto:pbis...@pppl.gov><mailto:pbis...@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 _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org<mailto:Beowulf@beowulf.org><mailto:Beowulf@beowulf.org> sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.b eowulf.org<http://eowulf.org>%2Fmailman%2Flistinfo%2Fbeowulf&data=02%7C01%7Cnovosirj%40rutg ers.edu<http://ers.edu>%7Ca91c0d09885047db8ded08d5852beaa4%7Cb92d2b234d35447093ff69aca66 32ffe%7C1%7C1%7C636561346021256640&sdata=Eq4smdlMLwxS4nNkgAZlfDcc6Sl2gl3 NvuRZrt3AIxI%3D&reserved=0<https://na01.safelinks.protection.outlook.com /?url=http%3A%2F%2Fwww.beowulf.org<http://2Fwww.beowulf.org>%2Fmailman%2Flistinfo%2Fbeowulf&data=0 2%7C01%7Cnovosirj%40rutgers.edu<http://40rutgers.edu>%7Cc4cd547515a346014d0d08d5852058a0%7Cb92 d2b234d35447093ff69aca6632ffe%7C1%7C0%7C636561296368291958&sdata=4fTJudM 1x6k1L3KPRsLITJEy%2FKI%2FqaXOGJ6qwDJmgG4%3D&reserved=0> _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org<mailto:Beowulf@beowulf.org><mailto:Beowulf@beowulf.org> sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.b eowulf.org<http://eowulf.org>%2Fmailman%2Flistinfo%2Fbeowulf&data=02%7C01%7Cnovosirj%40rutg ers.edu<http://ers.edu>%7Cc4cd547515a346014d0d08d5852058a0%7Cb92d2b234d35447093ff69aca66 32ffe%7C1%7C0%7C636561296368291958&sdata=4fTJudM1x6k1L3KPRsLITJEy%2FKI%2 FqaXOGJ6qwDJmgG4%3D&reserved=0 _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org<mailto:Beowulf@beowulf.org> sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.b eowulf.org<http://eowulf.org>%2Fmailman%2Flistinfo%2Fbeowulf&data=02%7C01%7Cnovosirj%40rutg ers.edu<http://ers.edu>%7Ca91c0d09885047db8ded08d5852beaa4%7Cb92d2b234d35447093ff69aca66 32ffe%7C1%7C1%7C636561346021256640&sdata=Eq4smdlMLwxS4nNkgAZlfDcc6Sl2gl3 NvuRZrt3AIxI%3D&reserved=0 -- ____ || \\UTGERS, |----------------------*O*------------------------ ||_// the State | Ryan Novosielski - novos...@rutgers.edu<mailto:novos...@rutgers.edu> || \\ University | Sr. Technologist - 973/972.0922 ~*~ RBHS Campus || \\ of NJ | Office of Advanced Res. Comp. - MSB C630, Newark `' -- Gavin W. Burris Senior Project Leader for Research Computing The Wharton School University of Pennsylvania Search our documentation: https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fresearch-it.wharton.upenn.edu%2Fabout%2F&data=02%7C01%7Cnovosirj%40rutgers.edu%7C81518df46beb4ae2339808d585cf437d%7Cb92d2b234d35447093ff69aca6632ffe%7C1%7C1%7C636562047597701062&sdata=SyA6EIUeAjIH9oZsQXkZOVAA03ImAy607mr7Zt6nBRQ%3D&reserved=0 Subscribe to the Newsletter: https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwhr.tn%2FResearchNewsletterSubscribe&data=02%7C01%7Cnovosirj%40rutgers.edu%7C81518df46beb4ae2339808d585cf437d%7Cb92d2b234d35447093ff69aca6632ffe%7C1%7C1%7C636562047597701062&sdata=UUC35NEU2oNL4O%2FPkcBaeiaZqpUy0g9OYtIQuB%2FlGD4%3D&reserved=0
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