Sync thread is exploited to perform flow control and notify the BQL libraryĪmount of bytes that have been transferred to the network device. The transmission ring, if in native mode, or to the installed qdisc, if in Request, so that pending packets in the netmap ring are transferred to The purpose of the sync thread is to periodically make a TXSYNC ioctl
Periodically request a synchronization of the netmap ring. Transfer a packet written to a slot of the netmap ring to the transmission To reduce the cost of the system calls, netmap does not automatically The sync thread is required because, in order The initialization of the NetmapNetDevice, an additional thread, To schedule the events of packet reception. To wait for new incoming packets in the netmap receiver rings, in order Real network device by writing/reading them to/from the netmap rings.įollowing the design of the FdNetDevice, a separate reading thread is So that ns-3 is able to send/receive packets to/from the In the initialization stage, the network device is switched to netmap mode, The exchange of packets with the netmap rings. Read/write methods, which have to make use of the netmap API to coordinate Initialization, because the NIC has to be put in netmap mode, and the The operations that require a specialized implementation are the Netmap is to have it inherit from the existing FdNetDevice and implementĪ specialized version of the operations specific to netmap. Real device, the straightforward approach to design a new NetDevice around Pasquale Imputato, Stefano Avallone, Enhancing the fidelity of network emulation through direct access to device buffers, Journal of Network and Computer Applications, Volume 130, 2019, Pages 63-75, ( )īecause netmap uses file descriptor based communication to interact with the Luigi Rizzo, “netmap: A Novel Framework for Fast Packet I/O”, Proceedings of 2012 USENIX Annual Techincal Conference, June 2012. Per second than emulation using FdNetDevice with raw sockets (which pass
UsersĬan expect that emulation support using Netmap will support higher packets Must support netmap and must be using a netmap-enabled device driver).
#Netmap emulation mode drivers#
Host system has netmap support (and for best performance, the drivers The use of NetmapNetDevice requires that the The NetmapNetDevice for ns-3 was developed by Pasquale Imputato in the 2017-19 timeframe. Netmap was developed by Luigi Rizzo and is maintained as Host networking stack and gains direct access to network device. Netmap is a fast packet processing capability that bypasses the The NetmapNetDeviceHelper class supports the configuration of a NetmapNetDevice. This netmap file descriptor must be associated to a real ethernet device in the host machine. The fd-net-device module provides the NetmapNetDevice class, a class derivedįrom the FdNetDevice which is able to read and write traffic using a netmap file descriptor.
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