3 title: "Generic Segmentation Offload"
7 # Generic Segmentation Offload
11 Generic Segmentation Offload (GSO) reduces per-packet processing
12 overhead by enabling applications to pass a multi-packet buffer to
13 (v)NIC and process a smaller number of large packets (e.g. frame size of
14 64 KB), instead of processing higher numbers of small packets (e.g.
15 frame size of 1500 B), thus reducing per-packet overhead.
17 GSO tests for VPP vhostuser and tapv2 interfaces. All tests cases use iPerf3
18 client and server applications running TCP/IP as a traffic generator. For
19 performance comparison the same tests are run without GSO enabled.
21 ## GSO Test Topologies
23 Two VPP GSO test topologies are implemented:
25 1. iPerfC_GSOvirtio_LinuxVM --- GSOvhost_VPP_GSOvhost --- iPerfS_GSOvirtio_LinuxVM
27 - Tests VPP GSO on vhostuser interfaces and interaction with Linux
28 virtio with GSO enabled.
30 2. iPerfC_GSOtap_LinuxNspace --- GSOtapv2_VPP_GSOtapv2 --- iPerfS_GSOtap_LinuxNspace
32 - Tests VPP GSO on tapv2 interfaces and interaction with Linux tap
37 - iPerfC (client) and iPerfS (server) run in TCP/IP mode without upper
39 - Trial duration is set to 30 sec.
40 - iPerfC, iPerfS and VPP run in the single SUT node.
43 ## VPP GSOtap Topology
47 VPP GSOtap tests are executed without using hyperthreading. VPP worker runs on
48 a single core. Multi-core tests are not executed. Each interface belongs to
49 separate namespace. Following core pinning scheme is used:
51 - 1t1c (rxq=1, rx_qsz=4096, tx_qsz=4096)
52 - system isolated: 0,28,56,84
59 ### iPerf3 Server Configuration
61 iPerf3 version used 3.7
63 $ sudo -E -S ip netns exec tap1_namespace iperf3 \
64 --server --daemon --pidfile /tmp/iperf3_server.pid --logfile /tmp/iperf3.log --port 5201 --affinity <X>
66 For the full iPerf3 reference please see:
67 [iPerf3 docs](https://github.com/esnet/iperf/blob/master/docs/invoking.rst).
70 ### iPerf3 Client Configuration
72 iPerf3 version used 3.7
74 $ sudo -E -S ip netns exec tap1_namespace iperf3 \
75 --client 2.2.2.2 --bind 1.1.1.1 --port 5201 --parallel <Y> --time 30.0 --affinity <X> --zerocopy
77 For the full iPerf3 reference please see:
78 [iPerf3 docs](https://github.com/esnet/iperf/blob/master/docs/invoking.rst).
81 ## VPP GSOvhost Topology
85 VPP GSOvhost tests are executed without using hyperthreading. VPP worker runs
86 on a single core. Multi-core tests are not executed. Following core pinning
89 - 1t1c (rxq=1, rx_qsz=1024, tx_qsz=1024)
90 - system isolated: 0,28,56,84
93 - vm-iperf-s: 3,4,5,6,7
94 - vm-iperf-c: 8,9,10,11,12
98 ### iPerf3 Server Configuration
100 iPerf3 version used 3.7
103 --server --daemon --pidfile /tmp/iperf3_server.pid --logfile /tmp/iperf3.log --port 5201 --affinity X
105 For the full iPerf3 reference please see:
106 [iPerf3 docs](https://github.com/esnet/iperf/blob/master/docs/invoking.rst).
109 ### iPerf3 Client Configuration
111 iPerf3 version used 3.7
114 --client 2.2.2.2 --bind 1.1.1.1 --port 5201 --parallel <Y> --time 30.0 --affinity X --zerocopy
116 For the full iPerf3 reference please see:
117 [iPerf3 docs](https://github.com/esnet/iperf/blob/master/docs/invoking.rst).