Uint32_t ni_bufs_head /* head of extra bufs list */ The main structures and fields are indicated below:Ĭonst uint32_t ni_flags /* properties */Ĭonst uint32_t ni_tx_rings /* NIC tx rings */Ĭonst uint32_t ni_rx_rings /* NIC rx rings */ Sys/net/netmap.h, which is the ultimate reference for the In the rest of this (long) manual page we document various aspects of the netmap and VALE architecture, features and usage.ĭATA STRUCTURES The data structures in the mmapped memory region are detailed in For best performance, netmap requires explicit support in device drivers.
NIC SUPPORTS NETMAP DRIVERS
VALE and netmap pipes are implemented by a single kernel module, which also emulates the netmap API over standard drivers for devices without native netmap support. Netmap suports both non-blocking I/O through ioctls(), synchronization and blocking I/O through a file descriptor and standard OS mechanisms such as select(2), poll(2), epoll(2), kqueue(2). Similarly, VALE switch instances and ports, and netmap pipes can be created dynamically, providing high speed packet I/O between processes, virtual machines, NICs and the host stack. Userspace clients can dynamically switch NICs into netmap mode and send and receive raw packets through memory mapped buffers. Netmap, VALE and netmap pipes are at least one order of magnitude faster than standard OS mechanisms (sockets, bpf, tun/tap interfaces, native switches, pipes), reaching 14.88 million packets per second (Mpps) with much less than one core on a 10 Gbit NIC, about 20 Mpps per core for VALE ports, and over 100 Mpps for netmap pipes. All these are accessed interchangeably with the same API. Netmap pipes, a shared memory packet transport channel. VALE, a very fast and modular in-kernel software switch/dataplane, and It runs on FreeBSD and Linux, and includes
DESCRIPTION netmap is a framework for extremely fast and efficient packet I/O for both userspace and kernel clients.
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