![]() Queues of buffers ( rings) residing in an mmapped region. Interface ( NIC), to the host stack, or to a VALE switch. In the rest of this (long) manual page we document various aspects of the netmap and VALEĪRCHITECTURE netmap supports raw packet I/O through a port, which can be connected to a physical Performance, netmap requires native support in device drivers. Kernel module, which also emulates the netmap API over standard drivers. All types of netmap ports and the VALE switch are implemented by a single Through a file descriptor and standard OS mechanisms such as select(2), poll(2), epoll(2),Īnd kqueue(2). Netmap supports both non-blocking I/O through ioctl(2), synchronization and blocking I/O Similarly, VALE switch instances and ports, netmap pipes and netmap monitors can be created dynamically, providing high speed packet I/Oīetween processes, virtual machines, NICs and the host stack. Userspace clients can dynamically switch NICs into netmap mode and send and receive raw Without native netmap support can still use the API in emulated mode, which uses unmodifiedĭevice drivers and is 3-5 times faster than bpf(4) or raw sockets. Hardware) about 20 Mpps per core for VALE ports and over 100 Mpps for netmap pipes. Less than one core on 10 Gbit/s NICs 35-40 Mpps on 40 Gbit/s NICs (limited by the Using netmap on supported NICs reaches 14.88 million packets per second (Mpps) with much With suitably fast hardware (NICs, PCIe buses, CPUs), packet I/O Order of magnitude faster than standard OS mechanisms (sockets, bpf, tun/tap interfaces, Implementing a very fast and modular in-kernel software switch/dataplane Ī shared memory packet transport channel Ī mechanism similar to bpf(4) to capture trafficĪll these netmap ports are accessed interchangeably with the same API, and are at least one To access individual queues of network interfaces It runs on FreeBSD Linux and some versions of Windows,Īnd supports a variety of netmap ports, including SYNOPSIS device netmap DESCRIPTION netmap is a framework for extremely fast and efficient packet I/O for userspace and kernelĬlients, and for Virtual Machines. ![]() Netmap pipes - a shared memory packet transport channel NAME netmap - a framework for fast packet I/O VALE - a fast VirtuAl Local Ethernet using the
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