Re: [Qemu-devel] an error while loading checkpoint

[sparsh mittal]

I am using qemu as a part of Marss cycle-accurate simulator. http://marss86.org/~marss86/index.php/Home

$ qemu/qemu-system-x86_64 -m 4G -snapshot -loadvm ffnn -vnc :3 -icount 0 -drive cache=unsafe,file=/local/sparsh/specimage_sftn3.qcow2 -simconfig MyConfigs/ffnn_100M.cfg

 
Unknown savevm section type 32
qemu-system-x86_64: Error -22 while loading VM state
==================================
Another thing is that only in this checkpoint (ffnn), I get this error, and not in any other checkpoint.

==================================
Here is the information about the image:

$ qemu/qemu-img info /local/sparsh/specimage_sftn3.qcow2
image: /local/sparsh/specimage_sftn3.qcow2
file format: qcow2
virtual size: 9.3G (10000000000 bytes)

disk size: 30G
cluster_size: 65536
Snapshot list:
ID        TAG                 VM SIZE                DATE       VM CLOCK
1         sfff1                  1.9G 2011-12-02 14:45:23   00:16:36.700
2         sfft1                  2.4G 2011-12-02 15:13:21   00:16:12.117

3         stnn                   2.5G 2011-12-02 15:42:51   00:16:46.837
4         ftnn                   1.5G 2011-12-02 16:06:46   00:16:45.460
6         sftt1                  2.3G 2011-12-02 17:06:53   00:16:13.254

7         ffnn                   1.0G 2011-12-02 17:30:37   00:16:20.771
8         snnn                   2.4G 2011-12-02 17:50:50   00:16:10.128
9         sfft2                  1.6G 2011-12-02 18:45:32   00:16:11.053

11        sftt2                  2.3G 2011-12-02 20:04:26   00:16:15.169
12        sffn                   1.8G 2011-12-06 10:46:26   00:16:31.435
13        ttff                   2.0G 2011-12-06 11:05:40   00:16:05.729

====================
I also have question whether -icount 0 or -icount auto can make a simulation more deterministic and whether qemu is affected by the load on the host (i.e. how many processes are running?)
Sparsh

On Thu, Dec 8, 2011 at 3:53 AM, Stefan Hajnoczi <address@hidden> wrote:

On Wed, Dec 7, 2011 at 11:41 PM, sparsh mittal <address@hidden> wrote:
> I get this warning while using a checkpoint. I issued the command -m 4G
> -icount 0 and other parameters.
> Unknown savevm section type 32
> qemu-system-x86_64: Error -22 while loading VM state
>
> My computer has 48GB RAM, so I don't know what is the problem?

Looks like the stream has gotten out of sync.

Please post the full QEMU command-line as well as any monitor commands
you issued so it is possible to reproduce this.

Stefan