Re: [Qemu-devel] broken incoming migration

[Paolo Bonzini]

Il 04/06/2013 16:48, Peter Lieven ha scritto:
> Still using 3.2, but strange enough the above example is also not
> increasing RSS size for me.
> 
> Can you try the following:
> qemu git master with 1G of memory (hanging in bios with no boot device)
> and migrate it. Before migration RSS Size os somewhat
> around 16MB. After migration its RSS size is in the order of 1G.

That may be a kernel bug.  The kernel did not do the copy-on-write trick
on huge zero pages.  It was fixed last year, maybe 3.2 is not enough.
Try adding a MADV_HUGEPAGE madvise to the testcase and see if it reproduces.

Paolo