From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751762AbaABOyu (ORCPT ); Thu, 2 Jan 2014 09:54:50 -0500 Received: from smtp.citrix.com ([66.165.176.89]:14068 "EHLO SMTP.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751136AbaABOyt (ORCPT ); Thu, 2 Jan 2014 09:54:49 -0500 X-IronPort-AV: E=Sophos;i="4.95,591,1384300800"; d="scan'208";a="89239041" Message-ID: <52C57D9A.8050804@citrix.com> Date: Thu, 2 Jan 2014 14:54:18 +0000 From: David Vrabel User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.16) Gecko/20121215 Iceowl/1.0b1 Icedove/3.0.11 MIME-Version: 1.0 To: Konrad Rzeszutek Wilk CC: , , , Subject: Re: [Xen-devel] [PATCH] xen/grant-table: Force to use v1 of grants. References: <1388502919-8601-1-git-send-email-konrad.wilk@oracle.com> <1388502919-8601-2-git-send-email-konrad.wilk@oracle.com> In-Reply-To: <1388502919-8601-2-git-send-email-konrad.wilk@oracle.com> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.80.2.76] X-DLP: MIA1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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@oracle.com > CC: msw@amazon.com > Signed-off-by: Konrad Rzeszutek Wilk Reviewed-by: David Vrabel 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