Re: [Xen-devel] blkif shared ring

[Paul Durrant <paul.durrant@xxxxxxxxxx>]

I have a blkback patch that could be upstreamed. I'll put together a 
blkfront patch and post them together.
  Paul

Keir Fraser wrote:
> They did not.
>
>  -- Keir
>
> On 11/08/2009 00:20, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote:
>
> > Hi Geoff, et al --
> >
> > Did these blkfront/blkback multi-page patches
> > ever make it upstream?
> >
> > Thanks,
> > Dan
> >
> > > -----Original Message-----
> > > From: Geoffrey Lefebvre [mailto:geoffrey@xxxxxxxxx]
> > > Sent: Wednesday, November 19, 2008 9:57 PM
> > > To: Samvel Yuri
> > > Cc: Dutch Meyer; Samuel Thibault; xen-devel; Andrew Warfield
> > > Subject: Re: [Xen-devel] blkif shared ring
> > >
> > >
> > > On Tue, Nov 18, 2008 at 6:02 PM, Samvel Yuri
> > > <samvelox@xxxxxxxxx> wrote:
> > > > hello Geoffrey-
> > > >
> > > > Ahh, so Parallax project just do multi-page ring (and not
> > > entirely another
> > > > set of shared ring).
> > > Yes that's correct. We added a page to the existing ring.
> > >
> > > > am going to try 4 * PAGE_SIZE and see whether the box stays
> > > alive. Were the
> > >
> > > In our case going to a 4 pages ring didn't buy any additional
> > > performance. With 2 pages we were pretty close to saturating the
> > > gigabit link to the filer.
> > >
> > > > patches self
> > > > contained in blkfront & blkback? If possible a pointer to
> > > blkfront & blkback
> > > > will be useful.
> > > The patches for blkfront and back were pretty self contained. Blktap
> > > was a bit more spread out because it changed user space code as well.
> > > For blkfront/back, the most significant changes were to the ring setup
> > > protocol to pass more than one grant reference. I might have time to
> > > refresh the patches and post them to the list next week if that is of
> > > interest to anyone.
> > >
> > > cheers,
> > >
> > > geoffrey
> > >
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--
===============================
Paul Durrant, Software Engineer

Citrix Systems (R&D) Ltd.
First Floor, Building 101
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Milton Road
Cambridge CB4 0FY
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