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Re: [Qemu-devel] [Qemu-ppc] broken incoming migration
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [Qemu-ppc] broken incoming migration |
Date: |
Wed, 12 Jun 2013 10:00:37 -0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130514 Thunderbird/17.0.6 |
Il 08/06/2013 22:53, Benjamin Herrenschmidt ha scritto:
> On Sun, 2013-06-09 at 10:16 +0800, Wenchao Xia wrote:
>> If an page was not received and destination knows that page should
>> exist according to total size, fill it with zero at destination, would
>> it solve the problem?
>
> The easiest way to do that is to not write to those pages at the
> destination to begin with, when initializing the VM... Is there any way
> to know that a VM is being setup as a migration target or not ?
There is the "incoming" variable in vl.c (currently not a global), but I
suspect Peter's patch could have also broken loadvm. It could quickly
become a rat hole.
The only bug we have is not a performance bug related to compression;
it's that writing zero pages breaks overcommit. Let's fix that, and
only that.
Paolo
- Re: [Qemu-devel] broken incoming migration, (continued)
- Re: [Qemu-devel] broken incoming migration, Wenchao Xia, 2013/06/08
- Re: [Qemu-devel] broken incoming migration, Peter Lieven, 2013/06/09
- Re: [Qemu-devel] broken incoming migration, Alexey Kardashevskiy, 2013/06/10
- Re: [Qemu-devel] broken incoming migration, Peter Lieven, 2013/06/10
- Re: [Qemu-devel] broken incoming migration, Alexey Kardashevskiy, 2013/06/10
- Re: [Qemu-devel] broken incoming migration, Peter Lieven, 2013/06/10
- Re: [Qemu-devel] broken incoming migration, Alexey Kardashevskiy, 2013/06/10
- Re: [Qemu-devel] [Qemu-ppc] broken incoming migration, Benjamin Herrenschmidt, 2013/06/10
- Re: [Qemu-devel] [Qemu-ppc] broken incoming migration, Peter Lieven, 2013/06/10
- Re: [Qemu-devel] [Qemu-ppc] broken incoming migration, Benjamin Herrenschmidt, 2013/06/08
- Re: [Qemu-devel] [Qemu-ppc] broken incoming migration,
Paolo Bonzini <=
- Re: [Qemu-devel] [Qemu-ppc] broken incoming migration, Benjamin Herrenschmidt, 2013/06/12
- Re: [Qemu-devel] [Qemu-ppc] broken incoming migration, Paolo Bonzini, 2013/06/12
- Re: [Qemu-devel] [Qemu-ppc] broken incoming migration, Wenchao Xia, 2013/06/12
Re: [Qemu-devel] broken incoming migration, Wenchao Xia, 2013/06/08