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XEN kernel, CPU missing flags?

I'm using Opteron 6386SE processor, 16 cores. It's capabilites (flags) are here: CPU World But when I run cat /proc/cpuinfo (dom0 or guest), flags are missing, for example SSE3 and SSE4. flags :...
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Underclocking/undervolting AMD Opteron Processors to lower TDP rating

How does one safely lower the TDP rating of Opteron CPUs? I am willing to sacrifice some power, but wish to keep stability. Background: I have a TYAN S4985 Motherboard with 4 quad-core Opteron 8380 ...
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CentOS - Raid Speed Below Single Disk

I'm encountering some odd behavior and wondering if anyone has ideas what would be causing it. Setup: 2x 2.4GHz Opteron quad cores, 8GB RAM, 2x 500GB 7200 RPM SATA2 drives, with Clean minimal CentOS ...