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GUIDE How to Fix TSC on macOS

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EliteMacx86

EliteMacx86

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How to Fix TSC on macOS

Overview

The TSC (Time Stamp Counter) is responsible for ensuring that your CPU is running at its correct defined speed with the correct cores count. However, on some firmware (mostly HEDT/Server and ASUS Laptops) will not write the TSC to all cores which causes a slowdown and every running process is at extremely slow speed. Due to this, when attempting a clean install, the system may enter the boot loop state. To fix this issue, you have 3 options

MethodPurposeNotes
CpuTscSyncFor Laptops
For some HEDT Systems		Automatic Sync.
No customization is required.
VoodooTSCSyncFor HEDT SystemsAutomatic Sync.
No customization is required.
TSCAdjustResetFor Skylake X/W/SP and Cascade Lake X/W/SNeed to define threads
Customization is required.
 
EliteMacx86 said:
How to Fix TSC on macOS

Overview

The TSC (Time Stamp Counter) is responsible for ensuring that your CPU is running at its correct defined speed with the correct cores count. However, on some firmware (mostly HEDT/Server and ASUS Laptops) will not write the TSC to all cores which causes a slowdown and every running process is at extremely slow speed. Due to this, when attempting a clean install, the system may enter the boot loop state. To fix this issue, you have 3 options

MethodPurposeNotes
CpuTscSyncFor Laptops
For some HEDT Systems		Automatic Sync.
No customization is required.
VoodooTSCSyncFor HEDT SystemsAutomatic Sync.
No customization is required.
TSCAdjustResetFor Skylake X/W/SP and Cascade Lake X/W/SNeed to define threads
Customization is required.
Click to expand...
 
Last edited:
Was: The only way I can boot is using ResetTSCAdjust.efi tool on every boot or reboot. (Its a little bit of a pain!). The TSCAdjustReset.kext did not work for me on my Skylake CPU (i5-6600K).

Update:
I got TSCAdjustReset.kext to work by 1) removing all TSC-related boot-args and properly setting the IOCPUNumber in the kext (in my case it had to be 3 for the 4 threads in the CPU).

How:
"Open up the kext(ShowPackageContents in finder, Contents -> Info.plist) and change the Info.plist -> IOKitPersonalities -> IOPropertyMatch -> IOCPUNumber to the number of CPU threads you have starting from 0(i9 7980xe 18 core would be 35 as it has 36 threads total)." I used Xcode.

reference:
 
Last edited:
ebrunson said:
Was: The only way I can boot is using ResetTSCAdjust.efi tool on every boot or reboot. (Its a little bit of a pain!). The TSCAdjustReset.kext did not work for me on my Skylake CPU (i5-6600K).

Update:
I got TSCAdjustReset.kext to work by 1) removing all TSC-related boot-args and properly setting the IOCPUNumber in the kext (in my case it had to be 3 for the 4 threads in the CPU).

How:
"Open up the kext(ShowPackageContents in finder, Contents -> Info.plist) and change the Info.plist -> IOKitPersonalities -> IOPropertyMatch -> IOCPUNumber to the number of CPU threads you have starting from 0(i9 7980xe 18 core would be 35 as it has 36 threads total)." I used Xcode.

reference:
Click to expand...
The final solution for me was to add the ResetTSCAdjust.efi to the Drivers folder so that it is automatically be invoked. The TSCAdjustReset.kext worked intermittently.
 
Not sure why you need such implementation for an i5-6600K Desktop CPU. Normally, its required for HEDT/Server and/or systems with a buggy BIOS.
 
EliteMacx86 said:
Not sure why you need such implementation for an i5-6600K Desktop CPU. Normally, its required for HEDT/Server and/or systems with a buggy BIOS.
Click to expand...
I would imagine it's the latter. I have two Skylake systems running Sonoma (MSI H110M MB (with i5 6600K) and HP 280 G2 (with i5 6500)) that both suffer this affliction and I now have the solution.
 
Last edited:
ebrunson said:
I would imagine it's the latter. I have two Skylake systems running Sonoma (MSI H110M MB (with i5 6600K) and HP 280 G2 (with i5 6500)) that both suffer this affliction and I now have the solution.
Click to expand...
Could be possible.
 
EliteMacx86 said:
Could be possible.
Click to expand...
28 Core!! Damn Brotha Thats intense. I just got this X299 UP AND GOING and its pretty solid, my card is one down from yours which is the AMD RX 480 4GB VRAM -i7 9800xCPU 3.8GHZ. Ive done around 50 to 75 different laptops AIOs, minis Etc. But NONE of those compare to the Power of these Desktops which i just recently started to use. And i am glad that I did. Had to comment on the 28 Core im sure maybe youve uograded by now. Anyway Name is Rick. Peace brother
 
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RickyThaDragonjr said:
28 Core!! Damn Brotha Thats intense. I just got this X299 UP AND GOING and its pretty solid, my card is one down from yours which is the AMD RX 480 4GB VRAM -i7 9800xCPU 3.8GHZ. Ive done around 50 to 75 different laptops AIOs, minis Etc. But NONE of those compare to the Power of these Desktops which i just recently started to use. And i am glad that I did. Had to comment on the 28 Core im sure maybe youve uograded by now. Anyway Name is Rick. Peace brother
Click to expand...
Hey ya,

Yes, that's retired now and i've moved to a different platform. That's 32 Core. xD
 
EliteMacx86 said:
Hey ya,

Yes, that's retired now and i've moved to a different platform. That's 32 Core. xD
Click to expand...
Thats a fricken beast! How much RAM Can it hold? 128GB - 256GB?
 

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