On Tue, Jul 20, 2010 at 2:24 AM, Paolo Campegiani <[email protected]> wrote: >> I just had a question regarding virtualization, I have a processor >> that does not have VMX support, so KVM has to use qemu for the >> hypervisor and its quite slow. Does anyone really run VMs like this >> in production? > > It depends on which architecture you are virtualizing: if your target > is an x86/x86_64, hardware assisted virtualization is the correct > choice, otherwise you could trade a lot of performances for some > flexibility (doing properly an emulation and non a virtualization). > >>Would you guys say the trend towards virtualization >> has moved in favor of relying on VMX in the cpu for full >> virtualization only? > > Yes, see this article from LWN: http://lwn.net/Articles/353853/
I see, so I guess this pretty much makes something like xen paravirtualized guests obsolete doesn't it. I just wonder what most system admins are using, vmware for large environments, KVM for smaller ones? Thanks for your comments.. > We ran a few experiments to compare performance of VMware's > paravirtualization technique (VMI) and hardware MMU technologies (HWMMU) > on VMware's hypervisor. > > To give some background, VMI is VMware's paravirtualization > specification which tries to optimize CPU and MMU operations of the > guest operating system. For more information take a look at this > http://www.vmware.com/interfaces/paravirtualization.html > > In most of the benchmarks, EPT/NPT (hwmmu) technologies are at par or > provide better performance compared to VMI. > The experiments included comparing performance across various micro and > real world like benchmarks. > ==== > > Note that, just some years before, K. Adams and O. Agesen from VMWare, > wrote this excellent article (still an excellent reading) on ACM > SIGOPS, "A comparison of software and hardware techniques for x86 > virtualization", where they conclude on favor of VMI. > > _______________________________________________ > rhelv5-list mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/rhelv5-list > _______________________________________________ rhelv5-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/rhelv5-list
