Deep dive into Kernel

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..

For Network Security, AWS EC2 uses VLAN. * VLAN ID is tagged or untagged by NIC offloading.* TOR Switch sends packets with VLAN tags, we cannot see other traffic except my VLAN. VLAN Offload featuresroot@choonho-dev:~/vpp/src/plugins/dpdk/device# ethtool -k ens3Features for ens3:...rx-vlan-offload: on [fixed]tx-vlan-offload: on [fixed]...rx-vlan-filter: on [fixed] Detailed information using DPDK..

MySQL 에서 Stored Procedure 를 조회하는 방법 show procedure status where db = ''; Stored Procedure 의 쿼리 조회 show CREATE PROCEDURE ;

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한글 문장 분석https://github.com/likejazz/cnn-text-classification-tf 코드에 대한 설명http://www.wildml.com/2015/12/implementing-a-cnn-for-text-classification-in-tensorflow/ Text summarization with TensorFlowhttps://research.googleblog.com/2016/08/text-summarization-with-tensorflow.html