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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Alexey Kardashevskiy <aik@ozlabs.ru>
Cc: Peter Lieven <pl@kamp.de>,
	"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
	"qemu-ppc@nongnu.org" <qemu-ppc@nongnu.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Wenchao Xia <xiawenc@linux.vnet.ibm.com>,
	David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [Qemu-devel] [Qemu-ppc]  broken incoming migration
Date: Mon, 10 Jun 2013 19:33:35 +1000	[thread overview]
Message-ID: <1370856815.14883.53.camel@pasglop> (raw)
In-Reply-To: <51B5980B.6030200@ozlabs.ru>

On Mon, 2013-06-10 at 19:10 +1000, Alexey Kardashevskiy wrote:
> > I would prefer not to completely drop the patch since it saves bandwidth and
> > resources.
> 
> I would like migration to do what it should do - send pages no matter what,
> this is exactly what migration is for. If there any many, many empty pages
> (which I doubt to be a very often real life case), they could all merged in
> big consecutive chunks and sent at the end of migration.

I tend to agree. The problem of sending empty pages is purely a problem of
compression. If the current mechanism is deemed "not efficient enough" for
in the case of having lots of zero-pages, then by all means invent a better
packet format for more tightly representing them on the wire, but don't
break things by not sending them at all.

Cheers,
Ben.

  reply	other threads:[~2013-06-10  9:34 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                                               ` Benjamin Herrenschmidt [this message]
2013-06-10  9:42                                                 ` [Qemu-devel] [Qemu-ppc] " Peter Lieven
2013-06-09  2:53                             ` Benjamin Herrenschmidt
2013-06-12 14:00                               ` Paolo Bonzini
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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