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Re: [Qemu-devel] post-copy is broken?

From: Li, Liang Z
Subject: Re: [Qemu-devel] post-copy is broken?
Date: Mon, 18 Apr 2016 09:50:03 +0000

> > > > I've run it directly, setting relevant QTEST_QEMU_BINARY.
> > >
> > > Interesting; it's failing reliably for me - but only with a
> > > reasonably freshly booted machine (so that the pages get THPd).
> >
> > The same here. Freshly booted machine with 64GiB ram. I've checked
> > /proc/vmstat: huge pages were allocated
> Thanks for testing.
> Damn; this is confusing now.  I've got a RHEL7 box with 4.6.0-rc3 on where it
> works, and a fedora24 VM where it fails (the f24 VM is where I did the bisect
> so it works fine with the older kernel on the f24 userspace in that VM).
> So lets see:
>    works: Kirill's (64GB machine)
>           Dave's RHEL7 host (24GB RAM, dual xeon, RHEL7 userspace and kernel
> config)
>    fails: Dave's f24 VM (4GB RAM, 4 vcpus VM on my laptop24 userspace and
> kernel config)
> So it's any of userspace, kernel config, machine hardware or hmm.
> My f24 box has transparent_hugepage_madvise, where my rhel7 has
> transparent_hugepage_always (but still works if I flip it to madvise at run
> time).  I'll try and get the configs closer together.
> Liang Li: Can you run my test on your setup which fails the migrate and tell
> me what your userspace is?
> (If you've not built my test yet, you might find you need to add a :
>    tests/postcopy-test$(EXESUF): tests/postcopy-test.o
>   to the tests/Makefile)

Hi Dave,

  How to build and run you test? I didn't do that before.


> Dave
> >
> > --
> >  Kirill A. Shutemov
> --
> Dr. David Alan Gilbert / address@hidden / Manchester, UK

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