Deep dive into Kernel

Default setting DBGvpp# show threadsID Name Type LWP Sched Policy (Priority) lcore Core Socket State0 vpp_main 8745 other (0) 0 0 01 stats 8750 other (0) 0 0 0 Set number of worker threadsat /etc/vpp/startup.conf cpu { workers 2} DBGvpp# show threadsID Name Type LWP Sched Policy (Priority) lcore Core Socket State0 vpp_main 8856 other (0) 0 0 01 vpp_wk_0 workers 8861 other (0) 1 1 02 vpp_wk_1 wor..

Question0: segment_manager_alloc_session_fifos:464: No space to allocate fifos! 0: tcp46_listen_inline:2788: session accept fail DBGvpp# show session Thread 0: 2031 active sessions What is tunning parameter or codes to increase number of tcp session? AnswerWhen apps attach to the session layer they request a given size for the shared memory segment out of which fifos are allocated and also the s..

vpp# show run Name Clocks Vectors/Call FortyGigabitEthernet84/0/1-out 9.08e0 50.09 FortyGigabitEthernet84/0/1-tx 3.84e1 50.09 dpdk-input 7.45e1 50.09 interface-output 1.08e1 50.09 ip4-input-no-checksum 3.92e1 50.09 ip4-lookup 3.88e1 50.09 ip4-rewrite-transit 3.43e1 50.09Explain * The key statistic to note here: ip4-input-no-checksum costs 39 clocks per packet

Original Dochttps://www.slideshare.net/MichelleHolley1/the-universal-dataplane

VPP on an EC2 instance with SR-IOV support. AWS EC2 network provides VLAN tags. So VF NIC should strip VLAN tag. This is recommened config for dpdk section at /etc/vpp/startup.conf dpdk { dev default { num-rx-queues 2 num-tx-queues 2 vlan-strip-offload on } Reference[vpp-dev] VPP on EC2 instance https://lists.fd.io/pipermail/vpp-dev/2016-November/003367.html

DPDK related dpdk { ## Change default settings for all intefaces # dev default { ## Number of receive queues, enables RSS ## Default is 1 # num-rx-queues 3 ## Number of transmit queues, Default is equal ## to number of worker threads or 1 if no workers treads # num-tx-queues 3 ## Number of descriptors in transmit and receive rings ## increasing or reducing number can impact performance ## Defaul..

enum rte_eth_rx_mq_mode mq_modeuint32_t max_rx_pkt_lenuint16_t split_hdr_sizeuint64_t offloads__extension__ uint16_t header_split: 1__extension__ uint16_t hw_ip_checksum: 1__extension__ uint16_t hw_vlan_filter: 1__extension__ uint16_t hw_vlan_strip: 1__extension__ uint16_t hw_vlan_extend: 1__extension__ uint16_t jumbo_frame: 1__extension__ uint16_t hw_strip_crc: 1__extension__ uint16_t enable_sc..

ip4_glean static uword ip4_glean (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return (ip4_arp_inline (vm, node, frame, 1)); }

Apache Stratoshttps://www.slideshare.net/imesh/load-balancer-component-architecture-apache-stratos-400

cp -r sample ../../plugins/elbcp sample.am ../../plugins/elb.am add at src/configuration.ac ... PLUGIN_ENABLED(snat) PLUGIN_ENABLED(elb)... add at src/plugins/Makefile.am if ENABLE_ELB_PLUGIN include elb.am endif edit at src/plugins/elb.am # Buildmake wipemake build # You can see plugins (command: show plugins) Plugin path is: /root/dev/vpp/build-root/install-vpp_debug-native/vpp/lib64/vpp_plugi..