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1

First you should try to determine whether this problem is causes by a single process / application or system wide. There are probably tools (which I am not aware of) to do this in a more straightforward way but without them at hand I suggest to iterate through all processes which consume a relevant part of the CPU time and stop them for a moment (kill -STOP ...


2

The formula you used is the one for partitions with dedicated processors. Their capped cycles is essentially always equal to their "entitled" cycles. For shared processor LPARs, the formula is: Processor utilization % = ((capped_cycles + uncapped_cycles) / entitled_cycles) * 100 That can go above 100% if the LPAR goes over its entitled CPU usage, ...


6

At least with the Fedora 20 package qemu-img (1.6.2, 10.fc20) does not use AES-NI for AES crypto. Confirming One can verify it like this: Does the CPU have AES-NI? $ grep aes /proc/cpuinfo -i For example my Intel Core 7 has this extension. Install the necessary debug packages: # debuginfo-install qemu-img Run qemu-img in a debugger: $ gdb --args ...



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