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authorTony Luck <tony.luck@intel.com>2017-08-24 09:26:52 -0700
committerThomas Gleixner <tglx@linutronix.de>2017-08-25 22:00:45 +0200
commitd56593eb5eda8f593db92927059697bbf89bc4b3 (patch)
treef833391c5bc62aa2c5a7e308914f907c782b8985 /arch/x86/events/intel/Makefile
parent1d9807fc64c131a83a96917f2b2da1c9b00cf127 (diff)
downloadlinux-d56593eb5eda8f593db92927059697bbf89bc4b3.tar.gz
x86/intel_rdt: Turn off most RDT features on Skylake
Errata list is included in this document: https://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/6th-gen-x-series-spec-update.pdf with more details in: https://www.intel.com/content/www/us/en/processors/xeon/scalable/xeon-scalable-spec-update.html But the tl;dr summary (using tags from first of the documents) is: SKZ4 MBM does not accurately track write bandwidth SKZ17 CMT counters may not count accurately SKZ18 CAT may not restrict cacheline allocation under certain conditions SKZ19 MBM counters may undercount Disable all these features on Skylake models. Users who understand the errata may re-enable using boot command line options. Signed-off-by: Tony Luck <tony.luck@intel.com> Cc: Fenghua" <fenghua.yu@intel.com> Cc: Ravi V" <ravi.v.shankar@intel.com> Cc: "Peter Zijlstra" <peterz@infradead.org> Cc: "Stephane Eranian" <eranian@google.com> Cc: "Andi Kleen" <ak@linux.intel.com> Cc: "David Carrillo-Cisneros" <davidcc@google.com> Cc: Vikas Shivappa <vikas.shivappa@linux.intel.com> Link: http://lkml.kernel.org/r/3aea0a3bae219062c812668bd9b7b8f1a25003ba.1503512900.git.tony.luck@intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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