Looking through the output of 'xl dmesg' on a Skylake system (i5-6600K), I found a number of error messages that I do not encounter on a Haswell-based system. I have tried two motherboards from different manufacturers, with pretty much the same results. Below are some of the unexpected messages:
Not enabling x2APIC (upon firmware request) ... mwait-idle: does not run on family 6 model 94 ... [VT-D] iommu.c:875: iommu_fault_status: Primary Pending Fault [VT-D] INTR-REMAP: Request device [0000:f0:1f.0] fault index 0, iommu reg = ffff82c000201000 (on motherboard 1) [VT-D] INTR-REMAP: reason 22 - Present field in the IRTE entry is clear (on motherboard 2) [VT-D] INTR-REMAP: reason 25 - Blocked a compatibility format interrupt request This leads to a few questions: 1) Is there some reason x2APIC should not be enabled on Skylake? What consequence, if any, is there not having x2APIC enabled? 2) Should mwait-idle be available on Skylake? 3) What about the IOMMU errors on Skylake - are they a concern? Thank you, Eric
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