Re: [Xen-devel] blkif shared ring

[Samvel Yuri <samvelox@xxxxxxxxx>]

Thanks for your reply,  Geoffrey.

If its not too much work then the blkfront & blkback patches even with old XEN version
will be useful.

thanks,
Sam

---

From: Geoffrey Lefebvre <geoffrey@xxxxxxxxx>
To: Samvel Yuri <samvelox@xxxxxxxxx>
Cc: Dutch Meyer <dmeyer@xxxxxxxxx>; Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>; xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>; Andrew Warfield <andy@xxxxxxxxx>
Sent: Wednesday, November 19, 2008 8:57:11 PM
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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