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

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Message-ID: <52C57D9A.8050804@citrix.com>
Date:	Thu, 2 Jan 2014 14:54:18 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.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 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
we expecting to make use of it in the near future?

David
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