User advances head and cur, releasing some slots and holding others Ports and rings are created and controlled through a fileĭescriptor, created by opening a special deviceĪfter the syscall, there are some (h)eld and some (R)eceived slots The following section describes the system calls to create and controlĪnd netmap pipe ports). Independently configured to share memory. Pipe ports by default use separate memory regions, but can be dev/netmap file descriptors bound to NICs. Same memory region, accessible to all processes who own Through the rings, and possibly implement zero-copy forwarding betweenĪll NICs operating in netmap mode use the Netmap client can send or receive packets in batches An additionalĪfter binding a file descriptor to a port, a Ring for each transmit/receive queue of a NIC or virtual port. Ports use preallocated circular queues ofīuffers ( rings) residing in an mmapped region. Port, which can be connected to a physical interface ARCHITECTURE ¶ netmap supports raw packet I/O through a
Netmap support manual#
In the rest of this (long) manual page we document various aspectsĪrchitecture, features and usage. A list of such devices is at the end of this document. Performance, netmap requires native support inĭevice drivers. Switch are implemented by a single kernel module, which also emulates Through ioctl(2), synchronization and blocking I/O throughĪ file descriptor and standard OS mechanisms such as Providing high speed packet I/O between processes, virtual machines, NICs Netmap monitors can be created dynamically, Netmap mode and send and receive raw packets through Userspace clients can dynamically switch NICs into
Netmap support drivers#
Mode, which uses unmodified device drivers and is 3-5 times faster than Netmap support can still use the API in emulated Gbit/s NICs 35-40 Mpps on 40 Gbit/s NICs (limited by the hardware) aboutĢ0 Mpps per core for VALE ports and over 100 Mpps for Packet I/O using netmap on supported NICs reachesġ4.88 million packets per second (Mpps) with much less than one core on 10 With suitably fast hardware (NICs, PCIe buses, CPUs), Interchangeably with the same API, and are at least one order of magnitudeįaster than standard OS mechanisms (sockets, bpf, tun/tap interfaces, native Switch/dataplane netmap pipes a shared memory packet transport channel netmap monitors a mechanism similar to bpf(4) to capture traffic
Netmap support software#
Physical NIC ports to access individual queues of network interfaces host ports to inject packets into the host stack VALE ports implementing a very fast and modular in-kernel software Supports a variety of netmap ports, including On FreeBSD Linux and some versions of Windows, and Packet I/O for userspace and kernel clients, and for Virtual Machines. A shared memory packet transport channel SYNOPSIS ¶ device netmap DESCRIPTION ¶ netmap is a framework for extremely fast and efficient
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