So, i switch my vm container to bare metal in order to do some bench with native windows install. Seems the difference between vm and native in 3dmark firestrike is about 3%, just so you know.
2016-04-15 8:17 GMT+02:00 Blank Field <ihatethisfi...@gmail.com>: > > On Apr 15, 2016 9:01 AM, "thibaut noah" <thibaut.n...@gmail.com> wrote: > > Speaking of drives, it seems from what i read that it is possible for > qemu/kvm to read a native (non virtualize) install of windows from a > passthrough drive. > > If so is there something special to do? Might go to the hassle of > reinstalling my all windows system by i prefer to be sure before touching > anything (though i might just backup the image, boot my vm from it and > clone windows, much easier than reinstalling). > There is a problem, that i've promised to git bisect, but trashed my > fedora instead. > The thing is, you give the whole drive (or just the necessary partitions) > to the vm, and you can either boot the OS inside a VM, or run it bare-metal. > There are some culprits, for example: > If using UEFI, in order to properly mirror the install, you have to copy > the efivars. Windows relies on them to activate itself. > If using not virtio-scsi, you don't send the scsi commands. The most > noteworthy are SMART and TRIM. > And the final one, since some version of OVMF, GPT formatted drive gets > checked for valid MBR and it fails to boot. > But the performance is closest i could get to native, my HDD gets around > 150-180MBps, just as it does baremetal. > Not sure about IOPS though. > This kind of setup is useful for AB testing. >
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