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From: Paolo Bonzini <pbonzini@redhat.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Alexey Kardashevskiy <aik@ozlabs.ru>, Peter Lieven <pl@kamp.de>,
	"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
	"qemu-ppc@nongnu.org" <qemu-ppc@nongnu.org>,
	Wenchao Xia <xiawenc@linux.vnet.ibm.com>,
	David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [Qemu-devel] [Qemu-ppc]  broken incoming migration
Date: Wed, 12 Jun 2013 10:00:37 -0400	[thread overview]
Message-ID: <51B87F05.6060807@redhat.com> (raw)
In-Reply-To: <1370746424.3766.473.camel@pasglop>

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

  reply	other threads:[~2013-06-12 14:02 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-05-30  7:44 [Qemu-devel] broken incoming migration Alexey Kardashevskiy
2013-05-30  7:49 ` Alexey Kardashevskiy
2013-05-30  7:49 ` Paolo Bonzini
2013-05-30  8:18   ` Alexey Kardashevskiy
2013-05-30  9:08     ` Peter Lieven
2013-05-30  9:31       ` Alexey Kardashevskiy
2013-05-30 13:00       ` Paolo Bonzini
2013-05-30 13:38         ` Alexey Kardashevskiy
2013-05-30 14:08           ` Paolo Bonzini
2013-05-30 14:38         ` Peter Lieven
2013-05-30 14:41           ` Paolo Bonzini
2013-06-04 13:52             ` Peter Lieven
2013-06-04 14:14               ` Paolo Bonzini
2013-06-04 14:38                 ` Peter Lieven
2013-06-04 14:40                   ` Paolo Bonzini
2013-06-04 14:48                     ` Peter Lieven
2013-06-04 15:17                       ` Paolo Bonzini
2013-06-04 19:15                         ` Peter Lieven
2013-06-05  3:37                           ` Alexey Kardashevskiy
2013-06-05  6:09                             ` Peter Lieven
2013-06-09  4:12                               ` liu ping fan
2013-06-09  7:22                                 ` Peter Lieven
2013-06-04 15:10                     ` Peter Lieven
2013-06-08  8:27                       ` Wenchao Xia
2013-06-08  8:30                         ` Alexey Kardashevskiy
2013-06-09  2:16                           ` Wenchao Xia
2013-06-09  2:34                             ` Alexey Kardashevskiy
2013-06-09  2:52                               ` [Qemu-devel] [Qemu-ppc] " Benjamin Herrenschmidt
2013-06-09  3:01                                 ` Alexey Kardashevskiy
2013-06-09  3:01                               ` [Qemu-devel] " Wenchao Xia
2013-06-09  3:09                                 ` Alexey Kardashevskiy
2013-06-09  3:31                                   ` Wenchao Xia
2013-06-09  7:27                                   ` Peter Lieven
2013-06-10  6:39                                     ` Alexey Kardashevskiy
2013-06-10  6:50                                       ` Peter Lieven
2013-06-10  6:55                                         ` Alexey Kardashevskiy
2013-06-10  8:44                                           ` Peter Lieven
2013-06-10  9:10                                             ` Alexey Kardashevskiy
2013-06-10  9:33                                               ` [Qemu-devel] [Qemu-ppc] " Benjamin Herrenschmidt
2013-06-10  9:42                                                 ` Peter Lieven
2013-06-09  2:53                             ` Benjamin Herrenschmidt
2013-06-12 14:00                               ` Paolo Bonzini [this message]
2013-06-12 14:11                                 ` Benjamin Herrenschmidt
2013-06-12 20:10                                   ` Paolo Bonzini
2013-06-13  2:41                                     ` Wenchao Xia
2013-06-03 10:04           ` [Qemu-devel] " Alexey Kardashevskiy
2013-06-04 10:56             ` Peter Lieven
2013-06-08  8:24         ` Wenchao Xia
2013-05-30 10:18 ` Peter Maydell

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