Re: [Xen-devel] Configure block device IO rate

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Mon, Nov 24, 2014 at 03:11:20PM +0000, Ian Campbell wrote:
> On Mon, 2014-11-24 at 10:06 -0500, Konrad Rzeszutek Wilk wrote:
> > On Mon, Nov 24, 2014 at 12:07:39PM +0000, George Dunlap wrote:
> > > On Mon, Nov 24, 2014 at 3:54 AM, aragrawal <aragrawal@xxxxxxxxxxx> wrote:
> > > > Hi
> > > >
> > > > I am interested in getting the block I/O rate fixed for a Virtual 
> > > > Machine.
> > > > However, it seems that there are no such options to control the block 
> > > > I/O
> > > > rate via the VM configuration file.
> > > > Going through the net, I see suggestions to configure the xen_blkback 
> > > > driver
> > > > using ionice to get that done.
> > > >
> > > > I would like to know if there are any plans to include any such
> > > > configuration option.
> > > > Also, are there any particular reason (apart from the fact that there 
> > > > are
> > > > other ways to get this done) for the absence of such configuration 
> > > > option?
> > > 
> > > I'm pretty sure it's just because nobody had asked for it yet.
> > > 
> > > We can put it on our list of things to think about doing / projects
> > > for people new to the community.
> > > 
> > > We also accept patches. :-)
> > 
> > Patches for this were in the past posted - it just that nobody explained
> > to the maintainer (me) why the dm-* or io-nice would not do the same job.
> 
> AIUI the question here is why the toolstack doesn't integrate a guest
> cfg file setting to configure dm-* and/or io-nice, rather than why
> blkback doesn't duplicate their functionality.

Ah, that is a different question. That certainly could be done by somebody
who has the time.
> 
> Ian.
> 
> 

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel