Re: Applying Throttle Block Filter via QMP Command

[Alberto Garcia]

On Thu, Jan 09, 2025 at 11:02:46AM +0900, Henry lol wrote:
> scenario where throttle works as expected
> 
> 2-1 execute the qemu process with
> ...
> -object throttle-group,id=tg,x-bps-total=10485760 \
> -blockdev 
> '{"driver":"throttle","throttle-group":"tg","node-name":"throttle-node","file":{
>   
> "driver":"qcow2","node-name":"qcow2-node","file":{"driver":"file","filename":"/path/to/file.qcow2"}
> }}' \
> -device 
> virtio-blk-pci,scsi=off,drive=qcow2-node,id=did,bootindex=1,bus=pci.0,addr=0x05,serial=1234

How is this supposed to work as expected when the guest sees
qcow2-node (which is the unfiltered qcow2 file) instead of
throttle-node (which is the one that applies the limits that you set)?

   -device virtio-blk-pci,scsi=off,drive=qcow2-node
                                         ^^^^^^^^^^

If I run that example the x-bps-total limit is ignored.

Berto