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October 22nd, 2017 20:00
Disable hyperthreading @linux os
I have Dell Precision T7910 with 2 CPUs
For some reason, I want to disable CPU hyperthreading.
I disabled hyperthreadong in BIOS and rebooted.
After reboot, on linux command prompt,
I checked if hyperthreading disabled successfully as following
# dmidecode -t processor | grep 'Version\|Count'
Version: Intel(R) Xeon(R) CPU E5-2623 v4 @ 2.60GHz
Core Count: 4
Thread Count: 8
Version: Intel(R) Xeon(R) CPU E5-2623 v4 @ 2.60GHz
Core Count: 4
Thread Count: 8
I believe Thread count 8 means hyperthreading is still activated.
What can I do disable hyperthreading?
OS: Centos 7.3 live cd
BIOS Version: updated to lastest A20
No Events found!
speedstep
9 Legend
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47K Posts
1
October 23rd, 2017 05:00
Centos is not supported here nor is any other version of linux.
There is support for linux but its not free and it doesn't come from dell.
Redhat Enterprise Linux and Ubuntu have many company's that provide paid support @ $190 or more per hour.
RoHe
10 Elder
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45.2K Posts
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October 23rd, 2017 11:00
Sure you're saving the change to the HT setting before exiting BIOS Setup?
If you reopen Setup after changing the setting and rebooting, is HT back to Enabled or does BIOS still show HT as disabled? Will BIOS hold other changes?
Suspect that the motherboard battery may be weak/dead because HT = Enabled is the default setting.
Dan-H
4 Operator
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1.2K Posts
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October 23rd, 2017 11:00
how are you saving any changes in GRUB using a Live CD distro?
speedstep
9 Legend
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47K Posts
1
October 23rd, 2017 12:00
dmidecode -t shows what the processor is capable of NOT that Hyperthreading is Enabled or not.
-t, --type TYPE
Only display the SMBIOS entries of type TYPE. TYPE can be either a DMI type number, or a comma-separated list of type numbers, or a keyword from the following list: bios, system, baseboard, chassis, processor, memory, cache, connector, slot.
The SMBIOS specification defines the following DMItypes: