From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751109AbeEBDuB (ORCPT ); Tue, 1 May 2018 23:50:01 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:41166 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750859AbeEBDt6 (ORCPT ); Tue, 1 May 2018 23:49:58 -0400 Subject: Re: [RFC v3 0/5] virtio: support packed ring To: Tiwei Bie , mst@redhat.com, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org Cc: wexu@redhat.com, jfreimann@redhat.com References: <20180425051550.24342-1-tiwei.bie@intel.com> From: Jason Wang Message-ID: <31839145-3e87-2cc7-dfca-a09ae64b976a@redhat.com> Date: Wed, 2 May 2018 11:49:43 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <20180425051550.24342-1-tiwei.bie@intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2018年04月25日 13:15, Tiwei Bie wrote: > Hello everyone, > > This RFC implements packed ring support in virtio driver. > > Some simple functional tests have been done with Jason's > packed ring implementation in vhost: > > https://lkml.org/lkml/2018/4/23/12 > > Both of ping and netperf worked as expected (with EVENT_IDX > disabled). But there are below known issues: > > 1. Reloading the guest driver will break the Tx/Rx; It looks like the reason is we don't sync wrap counter information between host and qemu through VHOST_SET/GET_VRING_BASE. And both vhost and qemu need to do this through encoding warp counters to higher bits of vhost_vring_state.num, Thanks