[PLUG] log message

Denis Heidtmann denis.heidtmann at gmail.com
Thu Jul 10 15:22:45 UTC 2014


A message went by too fast to read during boot so I looked in dmsg.  I
found nothing which has meaning to me.  But I did see the following
snippet that I am curious about. What does " Please enable the IOMMU
option in the BIOS setup" mean?  What is an aperture?  Memory hole?

Thanks,
-Denis


[    0.000000] Kernel command line:
root=UUID=d7d8b1c0-f791-4bd6-98e0-a00044f8668e ro quiet splash
[    0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
[    0.000000] Checking aperture...
[    0.000000] No AGP bridge found
[    0.000000] Node 0: aperture @ 6002000000 size 32 MB
[    0.000000] Aperture beyond 4GB. Ignoring.
[    0.000000] Your BIOS doesn't leave a aperture memory hole
[    0.000000] Please enable the IOMMU option in the BIOS setup
[    0.000000] This costs you 64 MB of RAM
[    0.000000] Mapping aperture over 65536 KB of RAM @ cc000000
[    0.000000] PM: Registered nosave memory: 00000000cc000000 - 00000000d0000000
[    0.000000] Memory: 5894440k/6815744k available (6570k kernel code,
656264k absent, 265040k reserved, 6634k data, 924k init)
[    0.000000] SLUB: Genslabs=15, HWalign=64, Order=0-3, MinObjects=0,
CPUs=4, Nodes=1
[    0.000000] Hierarchical RCU implementation.
[    0.000000] RCU dyntick-idle grace-period acceleration is enabled.
[    0.000000] NR_IRQS:16640 nr_irqs:712 16
[    0.000000] spurious 8259A interrupt: IRQ7.



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