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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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[WARNING] Intel Skylake/Kaby Lake processors: broken hyper-threading

Posted by jpluimers on 2017/06/26

[WayBack[WARNING] Intel Skylake/Kaby Lake processors: broken hyper-threading via [WayBack] Affects all oses. Updated can be applied by updating your UEFI/BIOS microcode update for CPU. Make sure you apply those fixes. – nixCraft – Google+:

This warning advisory is relevant for users of systems with the Intel
processors code-named "Skylake" and "Kaby Lake".  These are: the 6th and
7th generation Intel Core processors (desktop, embedded, mobile and
HEDT), their related server processors (such as Xeon v5 and Xeon v6), as
well as select Intel Pentium processor models.

My own actions for now are below.

Find out which machines use CPUs on these lists:

Use these Linux commands to find out the model and hyperthreading support:

grep -E 'model|stepping' /proc/cpuinfo | sort -u
grep -qE '^flags.*[[:space:]]ht[[:space:]]' /proc/cpuinfo && \
echo "Hyper‐threading is supported"

Use this Windows command to find out the model:

wmic cpu get caption

Use this command on Mac OS X:

sysctl -n machdep.cpu.brand_string

If it’s on the list and supports hyperthreading, then disable hyperthreading.

–jeroen

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