[libvirt] speeding up qemu core dumps

[Eric Blake]

On 08/03/2011 08:37 AM, Jim Fehlig wrote:
> http://lists.nongnu.org/archive/html/qemu-devel/2011-02/msg01156.html
>
> I thought there were more discussions on the topic but can only find the
> above thread ATM.
>
> Do folks here have objections to increasing the migration speed prior to
> core dump?  If not, any suggestions for a value?  I set the migration
> speed to 1G in doCoreDump() prior to calling qemuMigrationToFile() with
> following improvement dumping a 4G guest

Why any limit at all?  When dumping to file rather than network, I can't 
think of any justification for a default limit when targetting a local 
drive (a particular installation may have a reasonable limit, especially 
if the file involved happens to use a network - think NFS).  It seems 
like it would make sense to override the qemu defaults and go with 
unlimited speed for faster dump and save operations.

-- 
Eric Blake   eblake at redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org