On Sat, Feb 10, 2007 at 02:22:25PM -0800, Dor Laor wrote: > > >hi, > > Can someone briefly explain what the cr3-cache feature on intel VT > >processors is and how it is used to improve performance in > >paravirtualization. > > In short, this is a unique Intel VT feature that supposed to save vmexit > on cr3 switch. The vmexit operation is quite expensive at the moment > (something like 2-5 ms!). PV kernels can use this feature by sharing ^^^^^^^^^^^^^^^^^^^^^^^^
Where do you measured this unbelievable large number? On AMD-V I measured around 2400 processor cycles for a VMEXIT/VMENTRY roundtrip. I would really really wonder if Intel-VT is that slow... Joerg -- Joerg Roedel Operating System Research Center AMD Saxony LLC & Co. KG ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier. Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ kvm-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/kvm-devel
