Am 05.06.2013 um 05:37 schrieb Alexey Kardashevskiy <a...@ozlabs.ru>:
> On 06/05/2013 05:15 AM, Peter Lieven wrote: >> >> Am 04.06.2013 um 17:17 schrieb Paolo Bonzini <pbonz...@redhat.com>: >> >>> 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. >> >> that's it. thanks for the pointer. the huge zero page was introduced in 3.8. >> >> paolo, alexey: can you please verify the following works for you: >> https://github.com/plieven/qemu/tree/fix-migration > > These two? > 848b796 Tue Jun 4 14:43:04 2013 +0200 Peter Lieven migration: do not > overwrite zero pages > 2206ac8 Tue Jun 4 14:25:33 2013 +0200 Peter Lieven Revert "migration: do > not sent zero pages in bulk stage" Yes, sorry forgot to mention this. > > That works for me (qemu 1.5, kernel 3.9-rc2). > Tested-by: Alexey Kardashevskiy <a...@ozlabs.ru> Thank you, Peter
