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[Xen-devel] How expensive is a VM EXIT?

  • From: Emre Can Sezer <ecsezer@xxxxxxxx>
  • Date: Tue, 03 Mar 2009 10:35:15 -0500
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Tue, 03 Mar 2009 07:35:40 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>


I've been trying to get a ballpark number on how expensive a VM EXIT is in terms of clock cycles. I'm also interested in how slow a TLB miss is. The only reference I was able to find was 13000 cycles for VM EXIT and around several hundred cycles for a TLB miss and a complete walk of page tables. Does anyone know from the top of their head or is there a reference you can share?

Thanks in advance.


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