Add instruction about how to use full cores really.

README.md

@@ -2,6 +2,8 @@
 
 If you want to use more than 64 cores in WSL2 (e.g. if you have AMD Threadripper 7980x), you can follow the steps:
 
+### Build `computecore.dll` for WSL2
+
 1. Generate project
 
         mkdir build
@@ -16,4 +18,28 @@ If you want to use more than 64 cores in WSL2 (e.g. if you have AMD Threadripper
 
 1. Launch any WSL2 distribution, type `nproc` or `lscpu`, you should see all cores.
 
-    ![use more than 64 cores in WSL2](img/use.more.than.64.cores.png)
+![use more than 64 cores in WSL2](img/use.more.than.64.cores.png)
+
+### Change hypervisor scheduler type
+
+Now you can see all cpus in WSL2, but actually, you might still can't use all of them. For example, if you run:
+
+    make -j`nproc`
+
+from task manager, you might still see only 50% cpus are working. That because the default hyperV scheduler is `Root`,
+all tasks are still not scheduled cross all cpu groups. You can run the following command from powershell console to
+check your current hyperV scheduler:
+
+    Get-WinEvent -FilterHashTable @{ProviderName="Microsoft-Windows-Hyper-V-Hypervisor"; ID=2} -MaxEvents 1
+
+If it outputs `Hypervisor scheduler type is 0x4`, it means you are using Root scheduler. You need run the following
+command to change the scheduler type to `Core`:
+
+    bcdedit /set hypervisorschedulertype Core
+
+Restart machine to take the settings effect. Note, if you enable bitlocker, you might need input the bitlocker key
+after restarting. So please save your bitlocker key before restarting.
+
+Now, you can use full cores really!
+
+![use full cores in WSL2](img/task.manager.full.cores.png)