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RE: [Xen-devel] blkif shared ring

To: Geoffrey Lefebvre <geoffrey@xxxxxxxxx>, Samvel Yuri <samvelox@xxxxxxxxx>
Subject: RE: [Xen-devel] blkif shared ring
From: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
Date: Mon, 10 Aug 2009 16:20:28 -0700 (PDT)
Cc: Dutch Meyer <dmeyer@xxxxxxxxx>, Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>, dean.samuels@xxxxxxxxxx, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Andrew Warfield <andy@xxxxxxxxx>
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Hi Geoff, et al --

Did these blkfront/blkback multi-page patches
ever make it upstream?


> -----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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