From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael S. Tsirkin" Subject: Re: [virtio-dev] Re: [PATCH net-next v2 0/5] virtio: support packed ring Date: Thu, 11 Oct 2018 09:48:48 -0400 Message-ID: <20181011094705-mutt-send-email-mst@kernel.org> References: <20180907012225.GA32677@debian> <20180907084509-mutt-send-email-mst@kernel.org> <20180910030053.GA15645@debian> <20180911053726.GA7472@debian> <20180912121457-mutt-send-email-mst@kernel.org> <20180913085919.GA42049@fbsd1.sh.intel.com> <98d6bd4d-45e2-4207-e961-782f649e0139@redhat.com> <20181010103335-mutt-send-email-mst@kernel.org> <20181011121221.GA27106@debian> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Jason Wang , virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, virtio-dev@lists.oasis-open.org, wexu@redhat.com, jfreimann@redhat.com To: Tiwei Bie Return-path: Content-Disposition: inline In-Reply-To: <20181011121221.GA27106@debian> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Thu, Oct 11, 2018 at 08:12:21PM +0800, Tiwei Bie wrote: > > > But if it's not too late, I second for a OUT_OF_ORDER feature. > > > Starting from in order can have much simpler code in driver. > > > > > > Thanks > > > > It's tricky to change the flag polarity because of compatibility > > with legacy interfaces. Why is this such a big deal? > > > > Let's teach drivers about IN_ORDER, then if devices > > are in order it will get enabled by default. > > Yeah, make sense. > > Besides, I have done some further profiling and debugging > both in kernel driver and DPDK vhost. Previously I was mislead > by a bug in vhost code. I will send a patch to fix that bug. > With that bug fixed, the performance of packed ring in the > test between kernel driver and DPDK vhost is better now. OK, if we get a performance gain on the virtio side, we can finally upstream it. If you see that please re-post ASAP so we can put it in the next kernel release. -- MST