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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
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Posted 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.
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Posted October 23rd, 2017 11:00
how are you saving any changes in GRUB using a Live CD distro?
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Posted 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:
Type Information 1 System 2 Base Board 3 Chassis 4 Processor 5 Memory Controller 6 Memory Module 7 Cache 8 Port Connector 9 System Slots 10 On Board Devices 11 OEM Strings 12 System Configuration Options 13 BIOS Language 14 Group Associations 15 System Event Log 16 Physical Memory Array 17 Memory Device 18 32-bit Memory Error 19 Memory Array Mapped Address 20 Memory Device Mapped Address 21 Built-in Pointing Device 22 Portable Battery 23 System Reset 24 Hardware Security 25 System Power Controls 26 Voltage Probe 27 Cooling Device 28 Temperature Probe 29 Electrical Current Probe 30 Out-of-band Remote Access 31 Boot Integrity Services 32 System Boot 33 64-bit Memory Error 34 Management Device 35 Management Device Component 36 Management Device Threshold Data 37 Memory Channel 38 IPMI Device 39 Power Supply 40 Additional Information 41 Onboard Device
speedstep
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46969 Posts
2452
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Posted 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.