From: Paolo Bonzini <pbonzini@redhat.com>
To: "Dr. David Alan Gilbert" <dgilbert@redhat.com>,
Gary R Hook <grhookatwork@gmail.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Tunneled Migration with Non-Shared Storage
Date: Tue, 18 Nov 2014 22:38:28 +0100 [thread overview]
Message-ID: <546BBC54.5050900@redhat.com> (raw)
In-Reply-To: <20141118202805.GC29868@work-vm>
On 18/11/2014 21:28, Dr. David Alan Gilbert wrote:
> This seems odd, since as far as I know the tunneling code is quite separate
> to the migration code; I thought the only thing that the migration
> code sees different is the file descriptors it gets past.
> (Having said that, again I don't know storage stuff, so if this
> is a storage special there may be something there...)
Tunnelled migration uses the old block-migration.c code. Non-tunnelled
migration uses the NBD server and block/mirror.c. The main problem with
the old code is that uses a possibly unbounded amount of memory in
mig_save_device_dirty and can have huge jitter if any serious workload
is running in the guest.
Paolo
next prev parent reply other threads:[~2014-11-18 21:38 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <546B781B.3070309@gmail.com>
2014-11-18 16:51 ` [Qemu-devel] Tunneled Migration with Non-Shared Storage Gary R Hook
2014-11-18 20:28 ` Dr. David Alan Gilbert
2014-11-18 21:38 ` Paolo Bonzini [this message]
2014-11-19 9:35 ` Dr. David Alan Gilbert
2014-11-19 10:19 ` Paolo Bonzini
2014-11-19 10:55 ` Daniel P. Berrange
2014-11-19 20:00 ` Gary R Hook
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