Re: [Qemu-devel] [RFC]QEMU disk I/O limits

[Vivek Goyal]

On Tue, May 31, 2011 at 08:50:40AM -0500, Anthony Liguori wrote:
> On 05/31/2011 08:45 AM, Vivek Goyal wrote:
> >On Mon, May 30, 2011 at 01:09:23PM +0800, Zhi Yong Wu wrote:
> >>Hello, all,
> >>
> >>     I have prepared to work on a feature called "Disk I/O limits" for 
> >> qemu-kvm projeect.
> >>     This feature will enable the user to cap disk I/O amount performed by 
> >> a VM.It is important for some storage resources to be shared among 
> >> multi-VMs. As you've known, if some of VMs are doing excessive disk I/O, 
> >> they will hurt the performance of other VMs.
> >>
> >
> >Hi Zhiyong,
> >
> >Why not use kernel blkio controller for this and why reinvent the wheel
> >and implement the feature again in qemu?
> 
> blkio controller only works for block devices.  It doesn't work when
> using files.

So can't we comeup with something to easily determine which device backs
up this file? Though that will still not work for NFS backed storage
though.

Thanks
Vivek