> -----Original Message----- > From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Maxime Coquelin > Sent: Tuesday, September 27, 2016 4:43 PM > To: yuanhan.liu at linux.intel.com; Xie, Huawei <huawei.xie at intel.com>; > dev at dpdk.org > Cc: vkaplans at redhat.com; mst at redhat.com; > stephen at networkplumber.org; Maxime Coquelin > <maxime.coquelin at redhat.com> > Subject: [dpdk-dev] [PATCH v4] vhost: Add indirect descriptors support to > the TX path > > Indirect descriptors are usually supported by virtio-net devices, > allowing to dispatch a larger number of requests. > > When the virtio device sends a packet using indirect descriptors, > only one slot is used in the ring, even for large packets. > > The main effect is to improve the 0% packet loss benchmark. > A PVP benchmark using Moongen (64 bytes) on the TE, and testpmd > (fwd io for host, macswap for VM) on DUT shows a +50% gain for > zero loss. > > On the downside, micro-benchmark using testpmd txonly in VM and > rxonly on host shows a loss between 1 and 4%.i But depending on > the needs, feature can be disabled at VM boot time by passing > indirect_desc=off argument to vhost-user device in Qemu. > > Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
Hi Maxime, Seems this patch can't with Windows virtio guest in my test. Have you done similar tests before? The way I test: 1. Make sure https://patchwork.codeaurora.org/patch/84339/ is applied 2. Start testpmd with iofwd between 2 vhost ports 3. Start 2 Windows guests connected to the 2 vhost ports 4. Disable firewall and assign IP to each guest using ipconfig 5. Use ping to test connectivity When I disable this patch by setting: 0ULL << VIRTIO_RING_F_INDIRECT_DESC, the connection is fine, but when I restore: 1ULL << VIRTIO_RING_F_INDIRECT_DESC, the connection is broken. Thanks Zhihong