[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] can not use all available memory
On Fri, Nov 23, 2012 at 01:15:53PM +0000, Ian Campbell wrote: > On Fri, 2012-11-23 at 12:55 +0000, Pasi Kärkkäinen wrote: > > > > This has been discussed at length on the list before, please check the > > > archives. > > > > > > > I tried googling quickly but I didn't find anything relevant.. > > I found > http://web.archiveorange.com/archive/v/zCKz5T3PLvtyZDSPQc9i > in a matter of seconds, then: > http://lists.xen.org/archives/html/xen-devel/2011-11/msg01415.html > http://lists.xen.org/archives/html/xen-users/2012-05/msg00139.html > http://lists.xen.org/archives/html/xen-users/2012-05/msg00146.html > > > To me this behaviour still seems wrong. What's the point of autoballoon=1 > > trying to > > balloon down dom0 if the hypervisor already has enough free memory for the > > VM ? > > > > In this case: > > - dom0_mem=2G > > - new VM to launch with size 16 GB. > > - Xen has 28 GB of free memory. > > > > So clearly there's no need to try to balloon down dom0.. > > Right, so don't set autoballoon then. > It's enabled as a default.. so many people hit this problem. > > not-yet-implemented check/feature in xl, or a bug? > > Neither, it is the intended behaviour of xl autoballoon, this option > means exactly "take the required memory from dom0". > http://xenbits.xen.org/docs/4.2-testing/man/xl.conf.5.html "autoballoon=BOOLEAN If disabled then xl will not attempt to reduce the amount of memory assigned to domain 0 in order to create free memory when starting a new domain. You should set this if you use the dom0_mem hypervisor command line to reduce the amount of memory given to domain 0 by default. Default: 1" I think we should modify that to say "You should set autoballoon=0 if you use the dom0_mem hypervisor command line .." At least I understood that text in the opposite way.. Also: What happens if you have autoballoon=1 and you start some VMs, then stop the VMs, so most of the memory is now free in Xen.. and then you try to start a big VM ? Aren't you going to hit the same problem as in this thread? -- Pasi _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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