From: Rusty Russell Subject: Re: [PATCH] virtio: put last seen used index into ring itself Date: Tue, 18 May 2010 17:11:07 +0930 Message-ID: <201005181711.08128.rusty@rustcorp.com.au> References: <20100518004744.GA21359@redhat.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Cc: Jiri Pirko , Shirley Ma , Amit Shah , Mark McLoughlin , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, quintela@redhat.com, alex.williamson@redhat.com To: "Michael S. Tsirkin" Return-path: Received: from ozlabs.org ([203.10.76.45]:45892 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757316Ab0EROUR (ORCPT ); Tue, 18 May 2010 10:20:17 -0400 In-Reply-To: <20100518004744.GA21359@redhat.com> Sender: netdev-owner@vger.kernel.org List-ID: On Tue, 18 May 2010 10:17:44 am Michael S. Tsirkin wrote: > Generally, the Host end of the virtio ring doesn't need to see where > Guest is up to in consuming the ring. However, to completely understand > what's going on from the outside, this information must be exposed. > For example, host can reduce the number of interrupts by detecting > that the guest is currently handling previous buffers. Thanks applied. Cheers, Rusty.