On Saturday 28 March 2009 08:38:33 Alberto Treviño wrote: > On Thursday 26 March 2009 08:11:02 am Tomasz Chmielewski wrote: > > Like, two guests, each with 2 GB memory allocated only use 1 GB of > > host's memory (as long as they don't have many programs/buffers/cache)? > > > > So yes, it's also supported by KVM. > > The problem I've seen with this feature is that Windows guests end up > taking all of their available memory once they are up and running. For > example, booting Windows XP in KVM 82 show a steady increase in memory. > Then about the time the login box is about to appear, memory usage jumps to > the maximum allowed to the VM (512 MB in this case). I remember reading > somewhere Windows would try to initialize all memory during boot, causing > KVM to allocate all memory. VMware, however (and I don't know about > VirtualBox) knows about this and works around it, making sure memory isn't > all allocated during the Windows boot process. > > Would there a way to work around the Windows memory allocation issue in KVM > as well? KVM devs have a patch called KSM (short for kernel shared memory I think) that helps windows guests a good bit. See the original announcement [1] for some numbers. I spoke to one of the devs recently and they said they are going to resubmit it soon. [1] http://marc.info/?l=kvm&m=122688851003046&w=2 > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
