10-24-2014
Newer kernels include more support for CPU throttling, C-states. Probably stepping down the CPU when it can. What kind of load is the system usually under? Honestly even if your CPU is pegged 100% 24/7 you shouldnt be in 75-80C. Thats way too hot. 60C is where you want to be for a non-overclocked CPU even at 100% duty cycle. 30-45 for idle or normal use.
There is an entry in the kernel cpu config to enable or disable turbo speeds. ( not overclocking specifically) Maybe the old config happened to have that enabled, and the new one is disabled by default?
Not that you can compare to values pre-upgrade, but two things to look at that might be of use is to check the physical power usage of the box with a power-meter inline from the socket to the PSU. They can be had for $20-30. Again, not all that usefull without having "before" values to compare too. But more info on your system is always good to have. Second thing to look at is install "turbostat". It will show you the clock-rates and precentage of time each core is spending in various C states ( full power through idle/power-save modes). There are a handful of other tools that show the same info. Thats just the one I happened to use recently.
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psrinfo(1) General Commands Manual psrinfo(1)
NAME
psrinfo, pinfo - Displays processor administration information
SYNOPSIS
/usr/sbin/psrinfo -n
/usr/sbin/psrinfo [-v] [processor...]
/usr/sbin/psrinfo -s processor
/usr/sbin/pinfo [-v] [processor...]
OPTIONS
Displays the number of processors in the system. Enables verbose mode. Writes only a boolean value to standard output. The -s option
requires a single processor identification number (processor). The -s option is intended to be used in scripts. A value of 1 is output if
the specified processor is on line. A value of 0 is output if the specified processor is off line.
DESCRIPTION
The psrinfo and pinfo commands display information about processors. The processor variable specifies the processor identification number,
which is a unique integer that identifies the processor. If you do not specify any options or a processor identification number, the com-
mands display information about all processors.
EXAMPLES
The following is an example of the default prsinfo command output (no options or processor identification numbers):
greene:> psrinfo 0 on-line since 11/03/1999 09:41:34 1 on-line since 11/03/1999 09:41:34 2 off-line since
11/03/1999 08:41:34
The following example shows how to use the psrinfo command with the -s option in a shell script to determine the state of the pro-
cessor with an identification number of 1:
if [ "`psrinfo -s 1 2> /dev/null`" -eq 1 ] then echo "processor 1 is up" else echo "processor 1 is down" fi The following
example shows how to use the psrinfo command with the -v option:
% psrinfo -v Status of processor 0 as of: 05/23/00 15:47:40
Processor has been on-line since 05/23/2000 15:08:04
The alpha EV5.6 (21164A) processor operates at 465 MHz,
and has an alpha internal floating point processor. Status of processor 1 as of: 05/23/00 15:47:40
Processor has been on-line since 05/23/2000 15:08:04
The alpha EV5.6 (21164A) processor operates at 465 MHz,
and has an alpha internal floating point processor. Status of processor 2 as of: 05/23/00 15:47:40
Processor has been off-line since 05/23/2000 15:08:04
The alpha EV5.6 (21164A) processor operates at 465 MHz,
and has an alpha internal floating point processor. Status of processor 3 as of: 05/23/00 15:47:40
Processor has been on-line since 05/23/2000 15:14:00
The alpha EV5.6 (21164A) processor operates at 465 MHz,
and has an alpha internal floating point processor.
FILES
SEE ALSO
Commands: pset_assign_cpu(1), pset_assign_pid(1), pset_info(1), psradm(8)
Files: utmp(4)
Processor Sets: processor_sets(4)
psrinfo(1)