On (Fri) Jul 17 2009 [15:26:49], sudhir kumar wrote: > On Fri, Jul 17, 2009 at 12:47 PM, Dor Laor<dlaor@xxxxxxxxxx> wrote: > > On 07/17/2009 08:50 AM, Zhang Qian wrote: > >> > >> Hi, > >> > >> I have a KVM box which has 4GB physical memory totally, I'd like to > >> know how much I can use to run my domains, and how much will be > >> reserved by hypervisor(KVM) itself? > >> Thanks! > >> > > > > KVM and the Linux host use relatively low amount of memory. > > Unlike other hypervisors you know, kvm does not reserve memory and also is > > able to swap the guest memory, so you can even use more than 4G for your > Is that true? I think we can not allocate memory more than the > physical RAM. Or does upstream kvm supports it? My kvm version is not > that old but memory allocation failed for me when I tried to give the > whole memory on my host to the guest. What was the error? Also kvm only allocates memory for the guest when the guest needs it so even if you give all your host memory to the guest, it doesn't mean the guest will start using it immediately. Amit -- 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
