Hi,
I noticed there’re different ways to create throttle group based on doc:
https://github.com/qemu/qemu/blob/master/docs/throttle.txt
Option 1: through QMP “object-add”
Option 2: through “-object”
Based on the info(the following section I pasted) described in doc, my
understanding is option1 is stable way to create throttle-group while option2
is not, am I correct? Any confirmation would be appreciated!
“
A group can be created using the object-add QMP function:
{ "execute": "object-add",
"arguments": {
"qom-type": "throttle-group",
"id": "group0",
"limits" : {
"iops-total": 1000,
"bps-write": 2097152
}
}
}
throttle-group has a 'limits' property (of type ThrottleLimits as
defined in qapi/block-core.json) which can be set on creation or later
with 'qom-set'.
A throttle-group can also be created with the -object command line
option but at the moment there is no way to pass a 'limits' parameter
that contains a ThrottleLimits structure. The solution is to set the
individual values directly, like in this example:
-object throttle-group,id=group0,x-iops-total=1000,x-bps-write=2097152
Note however that this is not a stable API (hence the 'x-' prefixes) and
will disappear when -object gains support for structured options and
enables use of 'limits'.
“
--
Wu
