On Friday 03 Feb 2017 09:03:10 Peter Humphrey wrote: > On Thursday 02 Feb 2017 05:12:17 Dale wrote: > > Peter Humphrey wrote: > > > Hello list, > > > > > > I was looking through dmesg this morning and found 1231 instances (!) of > > > this error: > > > > > > DMAR: DMAR:[DMA Read] Request device [01:00.0] fault addr f400156000 > > > DMAR: [fault reason 06] PTE Read access is not set > > > > > > This is an Intel i7 box with an NVMe SSD and an AMD/ATI Amethyst XT > > > Radeon R9 M295X display card. The kernel is gentoo-sources-4.4.39. I've > > > tried setting intel_iommu=on or =pt as kernel parameter to no effect. I > > > don't want to set it =off because I've read that it slows the machine > > > dramatically. > > > > > > Googling has shown nothing, other than playing with that kernel > > > parameter. Does anyone here know what the problem is? > > > > I'm not sure if it applies but I found this: > > > > https://forums.gentoo.org/viewtopic-p-7904584.html#7904584 > > > > It should scroll down a bit to the post. The last comment seems to have > > a solution. > > > > Hope that helps. If not, maybe someone else has a better idea. > > Thanks, but no, it makes no difference here.
Peter, I recall a similar problem shown in the logs of an i7. and all I did was to enable IOMMU in the kernel, just as a message in the logs recommended. From memory I built in the kernel something like CONFIG_INTEL_IOMMU_DEFAULT_ON as well as some Intel related IOMMU options. I did not pass any options on the kernel line at boot time. The error messages stopped as a result. -- Regards, Mick
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