Am Montag, den 26.06.2017, 08:34 +0000 schrieb Holger Levsen: > On Sun, Jun 25, 2017 at 09:19:36AM -0300, Henrique de Moraes Holschuh > wrote: > [...] > > Apparently, Intel had indeed found the issue, *documented it* (see > > below) and *fixed it*. There was no direct feedback to the OCaml > > people, so they only found about it later. > > [...] > > We do not have enough information at this time to know how much > > software > > out there will trigger this specific defect. > > > > One important point is that the code pattern that triggered the > > issue in > > OCaml was present on gcc-generated code. There were extra > > constraints > > being placed on gcc by OCaml, which would explain why gcc > > apparently > > rarely generates this pattern. > > > > The reported effects of the processor defect were: compiler and > > application crashes, incorrect program behavior, including > > incorrect > > program output. > > > > > > What we know about the microcode updates issued by Intel related to > > these specific errata: > > > > Fixes for processors with signatures 0x406E3 and 0x506E3 are > > available in the Intel public Linux microcode release > > 20170511. This > > will fix only Skylake processors with model 78 stepping 3, and > > model 94 > > stepping 3. The fixed microcode for these two processor models > > reports > > revision 0xb9/0xba, or higher. > > > > Apparently, these errata were fixed by microcode updates issued in > > early > > April/2017. Based on this date range, microcode revision 0x5d/0x5e > > (and > > higher) for Kaby Lake processors with signatures 0x806e9 and > > 0x906e9 > > *might* fix the issue. We do not have confirmation about which > > microcode revision fixes Kaby Lake at this time. > > so in conclusion: don't buy intel. At least in future. In conclusion: don't buy AMD or Intel CPUs. AMD processors have bugs too. Just look at the recent changes to the amd64-microcode package. If you are unlucky, there might not even be a workaround and it can take months to reproduce, find the root cause and fix it. Comparing the patch IDs can give you a hint how many iterations were needed. I don't see much difference between AMD and Intel when comparing Henrique's announcement with my first-hand experience with one of the vendors. > I must say I'm utterly disappointed by this crap. "hey there is a hug > bug, we > dont tell you what it is exactly, or how we fixed it, but YOU MUST > INSTALL THIS > BINARY BLOB TO FIX IT. (and btw, this is for skylake, for kaby lake, > ahem, maybe, > we have no idea, but do install that crap^wblob too.") The same complaint can be said about the AMD microcode updates. -- Benjamin Drung System Developer Debian & Ubuntu Developer ProfitBricks GmbH Greifswalder Str. 207 D - 10405 Berlin Email: firstname.lastname@example.org Web: https://www.profitbricks.com Sitz der Gesellschaft: Berlin. Registergericht: Amtsgericht Charlottenburg, HRB 125506B. Geschäftsführer: Achim Weiss.
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