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Re: [Qemu-devel] [PATCH v2 8/9] qmp: add NBD server commands
From: |
Christoph Hellwig |
Subject: |
Re: [Qemu-devel] [PATCH v2 8/9] qmp: add NBD server commands |
Date: |
Wed, 31 Oct 2012 14:01:00 +0100 |
User-agent: |
Mutt/1.5.17 (2007-11-01) |
On Wed, Oct 31, 2012 at 01:46:22PM +0100, Paolo Bonzini wrote:
> qemu-nbd does support AIO in the latest versions. There's also
> --cache=MODE and --aio=MODE command-line options.
Oh true, it's just hidden behind coroutines. With --aio-native and
--nocache I actually get fairly reasonable performance out of it now.
> But if you need a QMP interface, adding it to qemu-nbd would really be a
> bad idea. :)
I don't nessecarily need QMP, I'm just looking for a way to create a
snapshot underneath an exported image.
> You can use qtest mode to get very close to this (even if you send
> stop/cont by mistake on the monitor, no code will actually run):
>
> qemu-system-x86_64 -chardev file,id=null,path=/dev/null -qtest null
> -machine accel=qtest -m 1 -nodefaults -nographic
>
> but having a separate do-nothing target would probably be nicer...
> though Anthony may have different opinions.
That looks fairlt reasonable, thanks.
- [Qemu-devel] [PATCH v2 7/9] block: add close notifiers, (continued)
- [Qemu-devel] [PATCH v2 7/9] block: add close notifiers, Paolo Bonzini, 2012/10/01
- [Qemu-devel] [PATCH v2 5/9] qemu-sockets: return IPSocketAddress from inet_parse, Paolo Bonzini, 2012/10/01
- [Qemu-devel] [PATCH v2 6/9] qemu-sockets: add socket_listen, socket_connect, socket_parse, Paolo Bonzini, 2012/10/01
- [Qemu-devel] [PATCH v2 8/9] qmp: add NBD server commands, Paolo Bonzini, 2012/10/01
- [Qemu-devel] [PATCH v2 9/9] hmp: add NBD server commands, Paolo Bonzini, 2012/10/01
- Re: [Qemu-devel] [PATCH v2 0/9] Embedded NBD server, Luiz Capitulino, 2012/10/01