Meltdown - AMD not affected - specific to Intel products Spectre - all cpus https://blogs.manageengine.com/desktop-mobile/2018/01/05/meltdown-and-spectre-battling-the-bugs-in-intel-amd-and-arm-processors.html -------- Message d'origine --------De : Jonathan Aquilina <jaquil...@eagleeyet.net> Date : 05/01/2018 17:47 (GMT+01:00) À : beowulf@beowulf.org Objet : Re: [Beowulf] [upgrade strategy] Intel CPU design bug & security flaw - kernel fix imposes performance penalty Chris on a number of articles I read they are saying AMD's are not affected by this.
On 05/01/2018 17:27, Christopher Samuel wrote: > On 05/01/18 10:48, Jörg Saßmannshausen wrote: > >> What I would like to know is: how about compensation? For me that is >> the same as the VW scandal last year. We, the users, have been >> deceived. > > I think you would be hard pressed to prove that, especially as it seems > that pretty much every mainstream CPU is affected (Intel, AMD, ARM, Power). > >> Specially if the 30% performance loss which have been mooted are not >> special corner cases but are seen often in HPC. Some of the chemistry >> code I am supporting relies on disc I/O, others on InfiniBand and >> again other is running entirely in memory. > > For RDMA based networks like IB I would suspect that the impact will be > far less as the system calls to set things up will be impacted but that > after that it should be less of an issue (as the whole idea of RDMA was > to get the kernel out of the way as much as possible). > > But of course we need real benchmarks to gauge that impact. > > Separating out the impact of various updates will also be important, > I've heard that the SLES upgrade to their microcode package includes > disabling branch prediction on AMD k17 family CPUs for instance. > > All the best, > Chris _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
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