From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konrad Rzeszutek Wilk Subject: Re: Add multi-page shared ring support to xen-blkfront/back Date: Wed, 3 Aug 2011 14:17:32 -0400 Message-ID: <20110803181732.GA32430@dumpdata.com> References: <1263318297-18527-1-git-send-email-paul.durrant@citrix.com> <4B4CB6AE.70005@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <4B4CB6AE.70005@citrix.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Paul Durrant Cc: pradeepv@amazon.com, "xen-devel@lists.xensource.com" List-Id: xen-devel@lists.xenproject.org On Tue, Jan 12, 2010 at 05:51:42PM +0000, Paul Durrant wrote: > Paul Durrant wrote: > >These patches add support for multi-page shared rings to xen-blkfront/back. > >Shared rings must always be a power of 2 in size and so the size is controlled > >by the new 'max_ring_page_order' module parameter of xen-blkback. This defaults > >to 0 so operationally there should be no difference with these patches in place. > >The maximum value of 'max_ring_page_order' is currently limited to 2 > >(i.e. 4 pages). > >xen-blkfront will always use the largest shared ring size supported by the back > >end. To override this and continue to use a single page ring, as before, set the > >'allow_multi_page_ring' module parameter to 0. Hey Paul, Would it be possible to rebase this on 3.0? How is it different from the one posted some time ago by .. um, somebody else?