From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: [PATCH 00/10] PV-IO v3 Date: Mon, 20 Aug 2007 17:14:03 +0300 Message-ID: <46C9A1AB.7090008@qumranet.com> References: <20070816231357.8044.55943.stgit@ghaskins-t60p.haskins.net> <1187313953.6449.70.camel@localhost.localdomain> <46C80C5B.7070009@qumranet.com> <1187617806.4363.179.camel@ghaskins-t60p.haskins.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, virtualization To: Gregory Haskins Return-path: In-Reply-To: <1187617806.4363.179.camel-5CR4LY5GPkvLDviKLk5550HKjMygAv58XqFh9Ls21Oc@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org Gregory Haskins wrote: >>> >>> >> Or, my preference, have a small sglist in the descriptor; >> > > > Define "small" ;) > 4. > There a certainly patterns that cannot/will-not take advantage of SG > (for instance, your typical network rx path), and therefore the sg > entries are wasted in some cases. Since they need to be (IMHO) u64, > they suck down at least 8 bytes a piece. Because of this I elected to > use the model of one pointer per descriptor, with an external descriptor > for SG. What are your thoughts on this? > Measurement will tell. I have a feeling that it won't really matter, so maybe an external sglist is best. -- error compiling committee.c: too many arguments to function ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/