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Re: [Qemu-devel] [PATCH v4 3/6] add backup related monitor commands
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH v4 3/6] add backup related monitor commands |
Date: |
Wed, 6 Mar 2013 13:44:24 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
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
- Re: [Qemu-devel] [PATCH v4 3/6] add backup related monitor commands, Stefan Hajnoczi, 2013/03/04
- Re: [Qemu-devel] [PATCH v4 3/6] add backup related monitor commands, Dietmar Maurer, 2013/03/04
- Re: [Qemu-devel] [PATCH v4 3/6] add backup related monitor commands, Kevin Wolf, 2013/03/04
- Re: [Qemu-devel] [PATCH v4 3/6] add backup related monitor commands, Dietmar Maurer, 2013/03/04
- Re: [Qemu-devel] [PATCH v4 3/6] add backup related monitor commands,
Stefan Hajnoczi <=
- Re: [Qemu-devel] [PATCH v4 3/6] add backup related monitor commands, Dietmar Maurer, 2013/03/06
- Re: [Qemu-devel] [PATCH v4 3/6] add backup related monitor commands, Kevin Wolf, 2013/03/06
- Re: [Qemu-devel] [PATCH v4 3/6] add backup related monitor commands, Dietmar Maurer, 2013/03/06
- Re: [Qemu-devel] [PATCH v4 3/6] add backup related monitor commands, Kevin Wolf, 2013/03/06
- Re: [Qemu-devel] [PATCH v4 3/6] add backup related monitor commands, Dietmar Maurer, 2013/03/06
- Re: [Qemu-devel] [PATCH v4 3/6] add backup related monitor commands, Kevin Wolf, 2013/03/07
- Re: [Qemu-devel] [PATCH v4 3/6] add backup related monitor commands, Dietmar Maurer, 2013/03/07
- Re: [Qemu-devel] [PATCH v4 3/6] add backup related monitor commands, Stefan Hajnoczi, 2013/03/07
- Re: [Qemu-devel] [PATCH v4 3/6] add backup related monitor commands, Dietmar Maurer, 2013/03/07
- Re: [Qemu-devel] [PATCH v4 3/6] add backup related monitor commands, Stefan Hajnoczi, 2013/03/08