[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-users] Re: 3.0.0-rc2: Xen: High amount of kernel "reserved" memory, about 33% in 256MB DOMU [workaround included]
Konrad Rzeszutek Wilk wrote: > On Tue, Jun 14, 2011 at 02:10:55AM +0200, Tobias Diedrich wrote: > > Konrad Rzeszutek Wilk wrote: > > > On Mon, Jun 13, 2011 at 10:50:03PM +0200, Tobias Diedrich wrote: > > > > Hi, > > > > > > > > another issue I'm seeing with 3.0-rc2 and Xen is that there is an > > > > unexpectedly high amount of kernel reserved memory. > > > > > > > > > > > I suspect that Linux allocates page table entries and corresponding > > > > data structures for the whole 6GB areas of the provided 'physical > > > > RAM map' even though it has rather big unusable holes in it. > > > > > > Can you run it with 'memblock=debug debug loglevel=8 initcall_debug'? > > > It should tell you where it tries (and for much space) the pagetables. > > Ugh. In the meantime I would suggest you do the combination of: > > Xen hypervisor line: "dom0_mem=max:512M" and on the Linux line: "mem=512M" to > cut down on the extra pagetable creation.. That helps a bit on dom0, for a 256MB dom0 it brings free memory up from 142MB |Memory: 145576k/6028224k available (6122k kernel code, 3932612k absent, 1950036k reserved, 4761k data, 576k init) to 173MB |Memory: 177156k/262144k available (6122k kernel code, 452k absent, 84536k reserved, 4761k data, 576k init) To shrink it more maybe the acpi tables would have to be moved... -- Tobias PGP: http://8ef7ddba.uguu.de _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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