Re: [Xen-devel] linux kernel 2.6.37

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Mon, Jan 24, 2011 at 11:19:02PM +0300, Vasiliy G Tolstov wrote:
> On Fri, 2011-01-21 at 19:16 +0300, Vasiliy G Tolstov wrote:
> > On Fri, 2011-01-21 at 10:30 -0500, Konrad Rzeszutek Wilk wrote:
> > 
> > > Do you see any messages during bootup about memory being returned? Look 
> > > for
> > > xen_release_chunk .. and pages freed ?
> [snip]
> 
> Hello. Konrad, do You have any progress about this issue?

Try booting your kernel with 'debug loglevel=10 memblock=debug'. I know that at 
least
64MB is used for SWIOTLB (which you don't need - you can disable that since you 
are
not doing any PCI passthrough), 6MB for kernel + kernel data. The 
"memblock=debug" will
give you the details to figure out who else is eating the big swaths of memory.

Is this also a problem if you boot the guest as HVM? What happens if you boot 
your
PV guest without 'maxmem=4096' and .. oh, I think I know why this is happening 
= the
kernel allocates pagetables as if you have 4GB of memory and that eats much of 
low memory.
If you decrease the 'maxmem' you should see a smaller amount being used.


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