From: Paolo Bonzini <pbonzini@redhat.com>
To: Orit Wasserman <owasserm@redhat.com>
Cc: quintela@redhat.com,
qemu-devel qemu-devel <qemu-devel@nongnu.org>,
Michael Roth <mdroth@linux.vnet.ibm.com>,
Isaku Yamahata <yamahata@valinux.co.jp>,
benoit.hudzia@sap.com, chegu_vinod@hp.com
Subject: Re: [Qemu-devel] Migration ToDo list
Date: Tue, 13 Nov 2012 18:16:30 +0100 [thread overview]
Message-ID: <50A2806E.20605@redhat.com> (raw)
In-Reply-To: <50A27EBF.3090402@redhat.com>
Il 13/11/2012 18:09, Orit Wasserman ha scritto:
>> >
>>> >> b) do scatter/gather of the pages?
> I would prefer to postpone changing the protocol and start with using iov (writev)
> for sending the pages (still sending header and than the page). Later we can
> move to scatter/gather I'm not sure of how large the performance gain will be.
>> >
>> > c) Remove compression of non-zero repetitive pages.
> +1
> we can look of identify the zero pages without calling is_dup_page which looks
> expensive.
Identifying ballooned zero pages is useful, because those cause the
clear_page calls in the kernel even in a guest that has been running for
a while.
But a generic solution doesn't really matter, because is_dup_page and
clear_page shouldn't really be in the profile in practice, except in
microbenchmarks.
Paolo
next prev parent reply other threads:[~2012-11-13 17:16 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-13 16:18 [Qemu-devel] Migration ToDo list Juan Quintela
2012-11-13 16:28 ` Paolo Bonzini
2012-11-13 17:09 ` Orit Wasserman
2012-11-13 17:16 ` Paolo Bonzini [this message]
2012-11-14 2:14 ` Isaku Yamahata
2012-11-14 2:20 ` Paolo Bonzini
2012-11-14 2:31 ` Isaku Yamahata
2012-11-13 16:40 ` Orit Wasserman
2012-11-13 16:48 ` Chegu Vinod
2012-11-13 16:57 ` Orit Wasserman
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