Intel dpdk Tutorial

•

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DPDK greatly improves packet processing performance and throughput by allowing applications to directly access hardware and bypass kernel involvement. It can improve performance by up to 10 times, allowing over 80 Mbps throughput on a single CPU or double that with two CPUs. This enables telecom and networking equipment manufacturers to develop products faster and with lower costs. DPDK achieves these gains through techniques like dedicated core affinity, userspace drivers, polling instead of interrupts, and lockless synchronization.

Software

Data Plane Development Kit
One Convergence Devices Ptv. Ltd
Saif

A chain is as strong as its weakest link

DPDK Boosts Packet Processing, Performance, and
Throughput
• Data Plane Development Kit (DPDK) greatly boosts packet processing
performance and throughput, allowing more time for data plane
applications.
• DPDK can improve packet processing performance by up to ten times.
It's possible to achieve over 80 Mbps throughput on a single
Intel® Xeon® processor, and double that with a dual-processor
configuration.1 As a result, telecom and network equipment
manufacturers (TEMs and NEMs) can lower development costs, use
fewer tools and support teams, and get to market faster.

User space
Kernel space
NIC
App
Driver
RX/TX
queues
Socket
Ring
buffers
Packet processing in Linux

User space
Kernel space
NIC
App
Driver
RX/TX
queues
Socket
Ring
buffers
Packet processing in Linux Packet processing with DPDK
User space
Kernel space
NIC
App DPDK
Ring
buffers
UIO
driver
RX/TX
queues

Kernel space
User space
HW
ioctl()
Register
syscall
VFS
copy_from_user()
iowrite()
Updating a register in Linux
User space
HW
assign
Register
Updating a register with DPDK

• Processor affinity (separate cores)
• UIO (no copying from kernel)
• Polling (no interrupts overhead)
• Lockless synchronization (avoid waiting)
What additionaly inside DPDK?

 Buffer and Memory Manager
Manage the allocation of objects non-NUMA
using huge pages through rings, reducing
TLB access, also, perform a pre-allocation of
fixed buffer space for each core
 Queue Manager
Implements lockless queues, allow packets to
be processed by different software
components with no contention
 Flow Classification
Implements hash functions from information
tuples, allow packets to be positioned rapidly
in their flow paths. Improves throughput
 Pool Mode Driver
Temporary hold times thus avoiding raise
NIC interruptions
Intel DPDK

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Intel dpdk Tutorial

1. Data Plane Development Kit One Convergence Devices Ptv. Ltd Saif

5. A chain is as strong as its weakest link

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11. DPDK Boosts Packet Processing, Performance, and Throughput • Data Plane Development Kit (DPDK) greatly boosts packet processing performance and throughput, allowing more time for data plane applications. • DPDK can improve packet processing performance by up to ten times. It's possible to achieve over 80 Mbps throughput on a single Intel® Xeon® processor, and double that with a dual-processor configuration.1 As a result, telecom and network equipment manufacturers (TEMs and NEMs) can lower development costs, use fewer tools and support teams, and get to market faster.

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13. User space Kernel space NIC App Driver RX/TX queues Socket Ring buffers Packet processing in Linux

14. User space Kernel space NIC App Driver RX/TX queues Socket Ring buffers Packet processing in Linux Packet processing with DPDK User space Kernel space NIC App DPDK Ring buffers UIO driver RX/TX queues

15. Kernel space User space HW ioctl() Register syscall VFS copy_from_user() iowrite() Updating a register in Linux User space HW assign Register Updating a register with DPDK

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20. • Processor affinity (separate cores) • UIO (no copying from kernel) • Polling (no interrupts overhead) • Lockless synchronization (avoid waiting) What additionaly inside DPDK?

21.  Buffer and Memory Manager Manage the allocation of objects non-NUMA using huge pages through rings, reducing TLB access, also, perform a pre-allocation of fixed buffer space for each core  Queue Manager Implements lockless queues, allow packets to be processed by different software components with no contention  Flow Classification Implements hash functions from information tuples, allow packets to be positioned rapidly in their flow paths. Improves throughput  Pool Mode Driver Temporary hold times thus avoiding raise NIC interruptions Intel DPDK

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24. InitializationandCoreLaunching

Intel dpdk Tutorial

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