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Re: [Qemu-devel] broken incoming migration

From: Peter Lieven
Subject: Re: [Qemu-devel] broken incoming migration
Date: Tue, 4 Jun 2013 21:15:20 +0200

Am 04.06.2013 um 17:17 schrieb Paolo Bonzini <address@hidden>:

> 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:


> Paolo

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