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vm:proxmox:kvm:windows:mitigations [2026/03/22 21:15] – niziakvm:proxmox:kvm:windows:mitigations [2026/10/13 19:08] (current) – niziak
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   * ''ivybridge'' CPU mark 4236. Memory mark: 1899. User experience slower than ''kvm64''   * ''ivybridge'' CPU mark 4236. Memory mark: 1899. User experience slower than ''kvm64''
   * ''ivybridge-IBRS'' - (Adds only ''spec-ctrl'') for security. CPU mark 4202. Memory mark: 1935.   * ''ivybridge-IBRS'' - (Adds only ''spec-ctrl'') for security. CPU mark 4202. Memory mark: 1935.
-  * ''x86-64-v2-AES'' CPU mark 4081. Memory mark: 1906. +  * ''x86-64-v2-AES'' CPU mark: 4081. Memory mark: 1906. 
-  * ''kvm64'' CPU mark 4030 +  * ''kvm64'' CPU mark: 4030. Memory mark: 1931. 
-  * ''host'' + ''hv-passthrough''CPU mark 4249+  * ''host'' + ''hv-passthrough''- pass HyperV flags to guest to let him know that it runs under VM. CPU mark 4249. Memory mark: 1899.
   * ''host'' - **insanely slow!!!** CPU mark 2750   * ''host'' - **insanely slow!!!** CPU mark 2750
  
-<file init /etc/pve/qemu-server/xxx.conf>+Benchmark 2 (new Proxmox, No numa, pinned to 8 cores - every 2nd to skip HT -  from 1 socket) 
 +  * ''kvm64,flags=+aes;-md-clear;-spec-ctrl'' - CPU mark: 3713, Memory mark: 2093   
 +  * ''IvyBridge,flags=+aes;-md-clear;-spec-ctrl''  - CPU mark: 3864, Memory mark: 1984 
 + 
 +Benchmark 3 (new Proxmox, numa 2x8, pinned to cores - every 2nd to skip HT) 
 +  * ''host,flags=+aes;-md-clear;-spec-ctrl'' - CPU mark: 2588, Memory mark: 2039  
 +  * ''IvyBridge-IBRS,flags=+aes;-md-clear;-spec-ctrl'' - CPU mark: 4295, Memory mark: 2065 
 + 
 +<file ini /etc/pve/qemu-server/xxx.conf>
 args: -cpu host,hv-passthrough args: -cpu host,hv-passthrough
-</conf>+</file>
  
  
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 </code> </code>
  
 +===== Win10 on old Xeon =====
 +
 +Very good performance:
 +<file ini /etc/pve/qemu-server/100.conf>
 +affinity: 0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30
 +cores: 8
 +numa: 1
 +cpu: IvyBridge-IBRS,flags=+aes;-md-clear;-spec-ctrl
 +</file>