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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 10:40:57 +0100 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
* Andrea Arcangeli (address@hidden) wrote:
> On Fri, Apr 15, 2016 at 06:23:30PM +0300, Kirill A. Shutemov wrote:
> > The same here. Freshly booted machine with 64GiB ram. I've checked
> > /proc/vmstat: huge pages were allocated
>
> I tried the test in a loop and I can't reproduce it here.
>
> Tested with gcc 4.9.3 and glibc 2.21 and glibc 2.22 so far,
> qemu&kernel/KVM latest upstream (4.6-rc3..).
>
> You can run this in between each invocation to guarantee all memory is
> backed by THP (no need of reboot):
>
> # echo 3 >/proc/sys/vm/drop_caches
> # echo >/proc/sys/vm/compact_memory
>
> 4.5 kernel built with gcc 5.3.1 run on a older userland worked fine
> too.
>
> Next thing to test would be if there's something wrong with qemu built
> with gcc 5.3.1 if run on top of a 4.4 kernel?
It's also working for me on f24 (4.5.0-320 packaged kernel) on a real machine;
so we currently have two sets that break:
a) Liang Li's setup (that breaks with the migrate of a real VM but I don't
think we have any details of the setup);
works with 4.4.x breaks with 4.5.x
b) f24 nested with my test, with THP enabled after Kirill's changes.
Dave
--
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, 2016/04/14
- 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, 2016/04/18
- Re: [Qemu-devel] post-copy is broken?, Andrea Arcangeli, 2016/04/15
- Re: [Qemu-devel] post-copy is broken?,
Dr. David Alan Gilbert <=
- Re: [Qemu-devel] post-copy is broken?, Li, Liang Z, 2016/04/18