Just a small note:
You can control the number of CPU cores Dom0 uses (named "Domain-0" in the Sun xVM environment).
This command:
# virsh setvcpus Domain-0 2results in that:
Sep 2 18:35:16 pgt01 unix: cpu0: externally initiated on-lineSep 2 18:35:17 pgt01 unix: cpu1: externally initiated on-lineSep 2 18:35:17 pgt01 unix: cpu2: externally initiated powered-offSep 2 18:35:18 pgt01 unix: cpu3: externally initiated powered-offCrazy.
OS is OpenSolaris snv_121, which was bfu'd from snv_118.
(Setting the memory use and max memory use via virsh setmem and virsh setmaxmen do also work as expected, the system begins to swap out pages and/or flushes zfs cache data on disk).
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