36. Glossary¶

Term Definition
ACL Access Control List
API Application Programming Interface
ASLR Linux* kernel Address-Space Layout Randomization
BSD Berkeley Software Distribution
Clr Clear
CIDR Classless Inter-Domain Routing
Control Plane The control plane is concerned with the routing of packets and with providing a start or end point.
Core A core may include several lcores or threads if the processor supports hyperthreading.
Core Components A set of libraries provided by the DPDK, including eal, ring, mempool, mbuf, timers, and so on.
CPU Central Processing Unit
CRC Cyclic Redundancy Check
ctrlmbuf An mbuf carrying control data.
Data Plane In contrast to the control plane, the data plane in a network architecture are the layers involved when forwarding packets. These layers must be highly optimized to achieve good performance.
DIMM Dual In-line Memory Module
Doxygen A documentation generator used in the DPDK to generate the API reference.
DPDK Data Plane Development Kit
DRAM Dynamic Random Access Memory
EAL The Environment Abstraction Layer (EAL) provides a generic interface that hides the environment specifics from the applications and libraries. The services expected from the EAL are: development kit loading and launching, core affinity/ assignment procedures, system memory allocation/description, PCI bus access, inter-partition communication.
FIFO First In First Out
FPGA Field Programmable Gate Array
GbE Gigabit Ethernet
HW Hardware
HPET High Precision Event Timer; a hardware timer that provides a precise time reference on x86 platforms.
ID Identifier
IOCTL Input/Output Control
I/O Input/Output
IP Internet Protocol
IPv4 Internet Protocol version 4
IPv6 Internet Protocol version 6
lcore A logical execution unit of the processor, sometimes called a hardware thread.
KNI Kernel Network Interface
L1 Layer 1
L2 Layer 2
L3 Layer 3
L4 Layer 4
LAN Local Area Network
LPM Longest Prefix Match
master lcore The execution unit that executes the main() function and that launches other lcores.
mbuf An mbuf is a data structure used internally to carry messages (mainly network packets). The name is derived from BSD stacks. To understand the concepts of packet buffers or mbuf, refer to TCP/IP Illustrated, Volume 2: The Implementation.
MESI Modified Exclusive Shared Invalid (CPU cache coherency protocol)
MTU Maximum Transfer Unit
NIC Network Interface Card
OOO Out Of Order (execution of instructions within the CPU pipeline)
NUMA Non-uniform Memory Access
PCI Peripheral Connect Interface
PHY An abbreviation for the physical layer of the OSI model.
pktmbuf An mbuf carrying a network packet.
PMD Poll Mode Driver
QoS Quality of Service
RCU Read-Copy-Update algorithm, an alternative to simple rwlocks.
Rd Read
RED Random Early Detection
RSS Receive Side Scaling
RTE Run Time Environment. Provides a fast and simple framework for fast packet processing, in a lightweight environment as a Linux* application and using Poll Mode Drivers (PMDs) to increase speed.
Rx Reception
Slave lcore Any lcore that is not the master lcore.
Socket A physical CPU, that includes several cores.
SLA Service Level Agreement
srTCM Single Rate Three Color Marking
SRTD Scheduler Round Trip Delay
SW Software
Target In the DPDK, the target is a combination of architecture, machine, executive environment and toolchain. For example: i686-native-linuxapp-gcc.
TCP Transmission Control Protocol
TC Traffic Class
TLB Translation Lookaside Buffer
TLS Thread Local Storage
trTCM Two Rate Three Color Marking
TSC Time Stamp Counter
Tx Transmission
TUN/TAP TUN and TAP are virtual network kernel devices.
VLAN Virtual Local Area Network
Wr Write
WRED Weighted Random Early Detection
WRR Weighted Round Robin