linux-kernel - Re: [Xen-devel] [PATCH] xen/grant-table: Force to use v1 of grants.

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Message-ID: <20140102191721.GK3021@pegasus.dumpdata.com>
Date:	Thu, 2 Jan 2014 14:17:21 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	David Vrabel <david.vrabel@...rix.com>
Cc:	xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
	annie.li@...cle.com, msw@...zon.com
Subject: Re: [Xen-devel] [PATCH] xen/grant-table: Force to use v1 of grants.

On Thu, Jan 02, 2014 at 02:54:18PM +0000, David Vrabel wrote:
> On 31/12/13 15:15, Konrad Rzeszutek Wilk wrote:
> > We have the framework to use v2, but there are no backends that
> > actually use it. The end result is that on PV we use v2 grants
> > and on PVHVM v1. The v1 has a capacity of 512 grants per page while
> > the v2 has 256 grants per page. This means we lose about 50%
> > capacity - and if we want more than 16 VIFs (each VIF takes
> > 512 grants), then we are hitting the max per guest of 32.
> > 
> > Oracle-bug: 16039922
> > CC: annie.li@...cle.com
> > CC: msw@...zon.com
> > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> 
> Reviewed-by: David Vrabel <david.vrabel@...rix.com>
> 
> What does v2 add anyway? Do we want to remove all v2 related code or are

Better status reporting page and two extra types of grants.

> we expecting to make use of it in the near future?

Yes, that is my understanding.
> 
> David
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