30 Nov
2016
30 Nov
'16
9:05 p.m.
On Tue, 29 Nov 2016 20:02:25 -0500
termtech <termtech(a)rogers.com> wrote:
Fascinating! ANY one or two of the cores are OK,
yet ANY three or all four of them causes the noises.
Don't know what CPU you have, but sounds like SMT (hyperthreading isn't
working well for you?
On my i7-2600k I've never seen problems with it. You could try to
disable it in the BIOS, or try these scripts for turning SMT on and off:
$ cat bin/smt-off
#!/bin/bash
# Be careful to not skip the space at the beginning nor the end
CPUS_TO_SKIP=" $(cat /sys/devices/system/cpu/cpu*/topology/thread_siblings_list |
sed 's/[^0-9].*//' | sort | uniq | tr "\r\n" " ") "
for CPU_PATH in /sys/devices/system/cpu/cpu[0-9]*; do
CPU="$(echo $CPU_PATH | tr -cd "0-9")"
echo "$CPUS_TO_SKIP" | grep " $CPU " > /dev/null
if [ $? -ne 0 ]; then
echo 0 > $CPU_PATH/online
fi
done
$ cat bin/smt-on
#!/bin/bash
# Be careful to not skip the space at the beginning nor the end
CPUS_TO_SKIP=" $(cat /sys/devices/system/cpu/cpu*/topology/thread_siblings_list |
sed 's/[^0-9].*//' | sort | uniq | tr "\r\n" " ") "
for CPU_PATH in /sys/devices/system/cpu/cpu[0-9]*; do
CPU="$(echo $CPU_PATH | tr -cd "0-9")"
echo "$CPUS_TO_SKIP" | grep " $CPU " > /dev/null
if [ $? -ne 0 ]; then
echo 1 > $CPU_PATH/online
fi
done
--
Joakim