Hi ozaki-r, thank you for answer.
So, there is no posibility that guest can request for more memory (max up to maxMemory) and libvirt/hypervisor/whatever will automatically increase it? I have to do it manually? Jaromir. Dne 17. července 2010 13:49 Ryota Ozaki <ozaki.ry...@gmail.com> napsal(a): > Hi Jaromír > 2010/7/17 Jaromír Červenka <cerv...@cervajz.com>: > > Hello, > > Could anybody explain me a little bit what is the difference between > > <currentMemory> and <maxMemory>. I use qemu-kvm hypervisor. When I have > > 1024MB maxMemory and 512MB of currentMemory, I can see just 512MB in > guest > > os (free -m). Is it ok? Does it have something to do with ballooning > > technique? What happened if guest will needs more memory than 512MB? > > In qemu-kvm case, currentMemory means actual amount of memory (or initial > amount > of memory) which you allow the guest to use and maxMemory means the maximum > amount of memory which you (or admin) can increase up to, through libvirt. > > With your setting, libvirt launches the VM with 1024MB memory and then > reduces > the amount of memory down to 512MB through balloon driver. So 512MB which > you're seeing in the guest is correct and expected. Because the rest > of the memory > has been reclaimed by the hypervisor, the guest cannot gain more memory > than > 512MB. The answer for the question--what happened?--is that the guest OS > will > behave as same as when it has just 512MB memory and gets memory pressure, > i.e., reclaim memory, do swapping, or something. > > If you want to allow the guest to gain more memory, at first you need > to increase > the amount of guest memory through the balloon driver (you know you can > change > the amount up to maxMemory at maximum). You can use virsh setmem for that. > > ozaki-r > > > Thank you for answers :) > > Kind regards, > > > > Jaromír Červenka > > Official openSUSE community member > > Web: http://www.cervajz.com/ > > Jabber: cerv...@cervajz.com > > MSN: jara.cerve...@seznam.cz > > Tel.: +420 607 592 687 > > Alt. e-mails: > > jaromir.cerve...@opensuse.org, > > jaromir.cerve...@speel.cz > > > > -- > > libvir-list mailing list > > libvir-list@redhat.com > > https://www.redhat.com/mailman/listinfo/libvir-list > > >
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