DPDK Overview
2016-04-01
DPDK 介绍
DPDK Libraries and Drivers
- Memory Manager: Responsible for allocating pools of objects in memory. A pool is created in huge page memory space and uses a ring to store free objects. It also provides an alignment helper to ensure that objects are padded to spread them equally on all DRAM channels.
- Buffer Manager: Reduces by a significant amount the time the operating system spends allocating and de-allocating buffers. The Intel® DPDK pre-allocates fixed size buffers which are stored in memory pools.
- Queue Manager:: Implements safe lockless queues, instead of using spinlocks, that allow different software components to process packets, while avoiding unnecessary wait times.
- Flow Classification: Provides an efficient mechanism which incorporates Intel® Streaming SIMD Extensions (Intel® SSE) to produce a hash based on tuple information so that packets may be placed into flows quickly for processing, thus greatly improving throughput.
- Poll Mode Drivers: The Intel® DPDK includes Poll Mode Drivers for 1 GbE and 10 GbE Ethernet* controllers which are designed to work without asynchronous, interrupt-based signaling mechanisms, which greatly speeds up the packet pipeline.
Memory Manager
Basic unit for runtime object allocation is the memory zone Zones contain rings, pools, LPM routing tables, or any other performance-critical structures Always backed by Huge Page (2 MB/1 GB page) memory
