Hi,
we found that the nsh make our TCP bandwidth loss. s
cene as following
threre ar two host: vm1(192.168.128.2), vm2(192.168.128.3)
1: host(vm1/vm2) send traffic to vpp_server0
2: vpp_server0 configrate the classify table and session for river the traffic to vpp_server1
3: vpp_server1 configrate the classify table and session to send the traffic back to vpp_server0
4: vpp_server0 send traffic to host
vpp_server 0/1 nsh configration (hit-next 27 mean nsh-classifier)
vpp_server0:
classify table mask l3 ip4 src
classify session hit-next 27 table-index 0 match l3 ip4 src 192.168.128.2 opaque-index 256255
classify session hit-next 27 table-index 0 match l3 ip4 src 192.168.128.3 opaque-index 256255
set interface l2 input classify intfc pipe1000.0 ip4-table 0
create nsh map nsp 1001 nsi 255 mapped-nsp 1001 mapped-nsi 255 nsh_action pop encap-none 3 0
create nsh map nsp 1002 nsi 255 mapped-nsp 1002 mapped-nsi 255 nsh_action pop encap-none 3 0
vpp_server1:
classify table mask l3 ip4 dst
classify session hit-next 27 table-index 0 match l3 ip4 dst 192.168.128.2 opaque-index 256511
classify session hit-next 27 table-index 0 match l3 ip4 dst 192.168.128.3 opaque-index 256767
we use iperf to test vm1/vm2 tcp bandwidth, it just 1Gbps
if we just modify the configration of vpp_server1 as following, tcp bandwidth will increate to 6Gbps we expected
classify session hit-next 27 table-index 0 match l3 ip4 dst 192.168.128.3 del
classify session hit-next 27 table-index 0 match l3 ip4 dst 192.168.128.3 opaque-index 256511
the vpp version we used is 19.08. we don't know why nsh cause this issue.
B.R.
joseph
