Re: Xen 4.3 development update

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Wed, Mar 06, 2013 at 11:52:50AM +0000, George Dunlap wrote:
> >>
> >> * Multi-page blk rings (external)
> >>  - blkback in kernel roger@citrix
> >>  - qemu blkback
> >>   status: Overall blk architecture being discussed
> >>   prognosis: Fair
> >
> >
> > I think we came up with so many design things that Roger is going to
> > be burried with this for a year or so :-(
> >
> > But I would say that the 'multi-page' aspect of this (which I think
> > is actually the indirect descriptor) is going to show up in v3.10.
> > Which is two months away. The only Xen patches are to update the
> > protocol description.
> 
> It sounds like we're actually talking about different things -- it
> seems like you're talking about a large blk protocol architecture
> rewrite, whereas I think I had always intended this just to be about
> multi-page blk rings, as that was percieved to be a scalability
> limitation.  If the multi-page aspect will turn up within a few months
> of the 4.3 release, I think that still counts as a success for this
> item.

Oh, in that case it is Bad. The multi-page has not even been on the list as
the other protocol architecture re-writes give a bigger boost in performance.

> 
> If that aspect looks good, can we mark this one as "Good" instead of "Fair"?
> 
>  -George