> -----Original Message----- > From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Wang, Zhihong > Sent: Friday, October 14, 2016 3:25 PM > To: Maxime Coquelin <maxime.coquelin at redhat.com>; > 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 > Subject: Re: [dpdk-dev] [PATCH v4] vhost: Add indirect descriptors support > to the TX path > > > > > -----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
The mrg_rxbuf feature is on. > > 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 >