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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=546BBC54.5050900@redhat.com \
--to=pbonzini@redhat.com \
--cc=dgilbert@redhat.com \
--cc=grhookatwork@gmail.com \
--cc=qemu-devel@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).