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Re: [Qemu-devel] post-copy is broken?
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] post-copy is broken? |
Date: |
Mon, 18 Apr 2016 10:55:29 +0100 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
* Li, Liang Z (address@hidden) wrote:
> > > > > 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$(EXESUF): tests/postcopy-test.o
> >
> > to the tests/Makefile)
> >
>
> Hi Dave,
>
> How to build and run you test? I didn't do that before.
Apply the code in:
http://lists.gnu.org/archive/html/qemu-devel/2016-04/msg02138.html
fix the:
+ if ( ((b + 1) % 255) == last_byte && !hit_edge) {
to:
+ if ( ((b + 1) % 256) == last_byte && !hit_edge) {
to tests/Makefile
tests/postcopy-test$(EXESUF): tests/postcopy-test.o
and do a:
make check
in qemu.
Then you can rerun the test with:
QTEST_QEMU_BINARY=path/to/qemu-system-x86_64 ./tests/postcopy-test
if it works, reboot and check it still works from a fresh boot.
Can you describe the system which your full test failed on? What distro on
the host? What type of host was it tested on?
Dave
>
> Thanks!
> Liang
>
> >
> > Dave
> > >
> > > --
> > > Kirill A. Shutemov
> > --
> > Dr. David Alan Gilbert / address@hidden / Manchester, UK
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- Re: [Qemu-devel] post-copy is broken?, (continued)
- Re: [Qemu-devel] post-copy is broken?, Dr. David Alan Gilbert, 2016/04/13
- Re: [Qemu-devel] post-copy is broken?, Andrea Arcangeli, 2016/04/13
- Re: [Qemu-devel] post-copy is broken?, Dr. David Alan Gilbert, 2016/04/14
- Re: [Qemu-devel] post-copy is broken?, Dr. David Alan Gilbert, 2016/04/14
- Re: [Qemu-devel] post-copy is broken?, Andrea Arcangeli, 2016/04/14
- Re: [Qemu-devel] post-copy is broken?, Kirill A. Shutemov, 2016/04/15
- Re: [Qemu-devel] post-copy is broken?, Dr. David Alan Gilbert, 2016/04/15
- Re: [Qemu-devel] post-copy is broken?, Kirill A. Shutemov, 2016/04/15
- Re: [Qemu-devel] post-copy is broken?, Dr. David Alan Gilbert, 2016/04/15
- Re: [Qemu-devel] post-copy is broken?, Li, Liang Z, 2016/04/18
- Re: [Qemu-devel] post-copy is broken?,
Dr. David Alan Gilbert <=
- Re: [Qemu-devel] post-copy is broken?, Li, Liang Z, 2016/04/18
- Re: [Qemu-devel] post-copy is broken?, Dr. David Alan Gilbert, 2016/04/18
- Re: [Qemu-devel] post-copy is broken?, Li, Liang Z, 2016/04/18
- Re: [Qemu-devel] post-copy is broken?, Dr. David Alan Gilbert, 2016/04/18
- Re: [Qemu-devel] post-copy is broken?, Dr. David Alan Gilbert, 2016/04/18
- Re: [Qemu-devel] post-copy is broken?, Dr. David Alan Gilbert, 2016/04/20
- Re: [Qemu-devel] post-copy is broken?, Dr. David Alan Gilbert, 2016/04/21
- Re: [Qemu-devel] post-copy is broken?, Andrea Arcangeli, 2016/04/27
- Re: [Qemu-devel] post-copy is broken?, Li, Liang Z, 2016/04/27
- Re: [Qemu-devel] post-copy is broken?, Dr. David Alan Gilbert, 2016/04/28