From: Stefan Hajnoczi <stefanha@gmail.com>
To: Dietmar Maurer <dietmar@proxmox.com>
Cc: Kevin Wolf <kwolf@redhat.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH v4 3/6] add backup related monitor commands
Date: Wed, 6 Mar 2013 13:44:24 +0100 [thread overview]
Message-ID: <20130306124424.GE1954@stefanha-thinkpad.muc.redhat.com> (raw)
In-Reply-To: <24E144B8C0207547AD09C467A8259F7557B278C1@lisa.maurer-it.com>
On Mon, Mar 04, 2013 at 02:33:16PM +0000, Dietmar Maurer wrote:
> > > > Is it using 64 KB writes and have you tried 256 KB writes?
> > >
> > > I use a modified 'qemu-img convert' at 64KB block size (I need 64KB for
> > backup).
> >
> > Maybe you'd better use a different output format that doesn't restrict you to
> > 64k writes.
>
> The output format is not really the restriction. The problem is that an additional
> IPC layer add overhead, an d I do not want that (because it is totally unnecessary).
I missed the reason why you cannot increase the block size. At least
increase the NBD write size - the VMA process can break up a large write
however it likes. Do this and the overhead is divided by 4.
Stefan
next prev parent reply other threads:[~2013-03-06 12:44 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20130220142939.GF16633@stefanha-thinkpad.muc.redhat.com>
[not found] ` <24E144B8C0207547AD09C467A8259F7557A6EFE2@lisa.maurer-it.com>
[not found] ` <20130221130345.GD22957@stefanha-thinkpad.redhat.com>
[not found] ` <24E144B8C0207547AD09C467A8259F7557A6FAAC@lisa.maurer-it.com>
[not found] ` <20130222095736.GA6107@stefanha-thinkpad.redhat.com>
[not found] ` <24E144B8C0207547AD09C467A8259F7557A70A61@lisa.maurer-it.com>
[not found] ` <20130225134551.GE3202@stefanha-thinkpad.redhat.com>
[not found] ` <24E144B8C0207547AD09C467A8259F7557AE0931@lisa.maurer-it.com>
[not found] ` <20130228144920.GD18389@stefanha-thinkpad.redhat.com>
[not found] ` <24E144B8C0207547AD09C467A8259F7557B12DDC@lisa.maurer-it.com>
2013-03-04 12:58 ` [Qemu-devel] [PATCH v4 3/6] add backup related monitor commands Stefan Hajnoczi
2013-03-04 13:16 ` Dietmar Maurer
2013-03-04 13:55 ` Kevin Wolf
2013-03-04 14:33 ` Dietmar Maurer
2013-03-06 12:44 ` Stefan Hajnoczi [this message]
2013-03-06 14:42 ` Dietmar Maurer
2013-03-06 15:22 ` Kevin Wolf
2013-03-06 15:33 ` Dietmar Maurer
2013-03-06 15:48 ` Kevin Wolf
2013-03-06 17:39 ` Dietmar Maurer
2013-03-07 9:04 ` Kevin Wolf
2013-03-07 9:22 ` Dietmar Maurer
2013-03-07 9:05 ` Stefan Hajnoczi
2013-03-07 9:28 ` Dietmar Maurer
2013-03-08 10:48 ` Stefan Hajnoczi
2013-03-08 11:01 ` Dietmar Maurer
2013-03-08 16:29 ` Stefan Hajnoczi
2013-03-08 17:44 ` Dietmar Maurer
2013-03-10 6:43 ` Stefan Hajnoczi
2013-03-10 9:32 ` Dietmar Maurer
2013-03-10 11:11 ` Stefan Hajnoczi
2013-03-09 14:13 ` Dietmar Maurer
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=20130306124424.GE1954@stefanha-thinkpad.muc.redhat.com \
--to=stefanha@gmail.com \
--cc=dietmar@proxmox.com \
--cc=kwolf@redhat.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).