Kernel_task hogging CPU on fresh install

Question

I am unsure what is causing the system to take up so CPU I have a fresh install of Yosemite. Below is the output of a diagnostic test. If anyone has a suggestion it would be greatly appreciated. I
Start time: 13:17:40 03/13/15
Model Identifier: MacBookPro8,2
System Version: OS X 10.10.2 (14C109)
Kernel Version: Darwin 14.1.0
Boot Mode: Normal
Time since boot: 27 minutes
SATA
   Samsung SSD 850 EVO 250GB             
System load
   combined level = Bad
   - thermal level = Bad
Log
   Mar 13 12:52:02 ** GPU Hardware VM is disabled (multispace: disabled, page table updates with DMA: disabled)
   Mar 13 12:52:18 BUG in process suhelperd[196]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)
   Mar 13 12:52:54 BUG in process suhelperd[196]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)
   Mar 13 12:55:48 AppleKeyStore: operation failed (pid: 247 sel: 15 ret: e00002ce)
   Mar 13 12:56:41 BUG in process suhelperd[196]: over-released legacy external boost assertions (0 total, 0 external, 0 legacy-external)
Activity
   CPU: user 2%, system 33%
Firewall: On
DNS: 108.169.253.1 (static)
Wi-Fi
   link auth: none
Restricted files: 32
Elapsed time (s): 452

Answer 1

The kernel is using excessive processor cycles. Below are some possible causes for the condition.
Throttling
When it gets high temperature readings from the hardware, or low voltage readings from the battery of a MacBook, the kernel may try to compensate by interrupting the processor(s) to slow them down and reduce power consumption. This condition can be due to:
☞ a buildup of dust on the logic board
☞ high ambient temperature
☞ a worn-out or faulty battery in a portable
☞ the malfunction of a cooling fan, a temperature sensor, a voltage sensor, or some other internal component
Note that if the problem is caused by a sensor, there may be no actual overheating or undervoltage.
If the computer is portable, test with and without the AC adapter connected. If kernel_task hogs the processor only on AC power, charging is causing the machine to heat up. That behavior may be normal for some models. CPU usage should drop when charging is complete.
Apple Diagnostics or the Apple Hardware Test, though not very reliable, is sometimes able to detect a fault. For more thorough hardware testing, make a "Genius" appointment at an Apple Store, or go to another authorized service provider.
If nothing is wrong with the hardware, then whatever you can do to improve cooling may help.
Installed software
Not applicable in this case.
Corrupt NVRAM or SMC data
Sometimes the problem is cleared up by resetting the NVRAM or the SMC.
External display
Connecting an external LCD display to some MacBook Pro models while the lid is open may cause this issue. If applicable, test by closing the lid or disconnecting the display. You might get better results with a newer LED display.