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32 .Nd playback a pcap file through a netmap interface
35 .Bl -tag -width "nmreplay"
38 .Op Fl i Ar netmap-interface
42 .Op Fl b Ar batch size
45 .Op Fl C Ar cpu-placement
50 to replay a pcap file through a netmap interface,
51 with programmable rates and possibly delays, losses
52 and packet alterations.
54 is designed to run at high speed, so the transmit schedule
55 is computed ahead of time, and the thread in charge of transmission
56 only has to pump data through the interface.
58 can connect to any type of netmap port.
60 Command line options are as follows
63 Name of the pcap file to replay.
65 Name of the netmap interface to use as output.
68 .It Fl b Ar batch-size
69 Maximum batch size to use during transmissions.
71 normally transmits packets one at a time, but it may use
72 larger batches, up to the value specified with this option,
73 when running at high rates.
74 .It Fl B Ar bps | Cm constant, Ns Ar bps | Cm ether, Ns Ar bps | Cm real Ns Op , Ns Ar speedup
75 Bandwidth to be used for transmission.
77 is a floating point number optionally follow by a character
78 (k, K, m, M, g, G) that multiplies the value by 10^3, 10^6 and 10^9
81 (can be omitted) means that the bandwidth will be computed
82 with reference to the actual packet size (excluding CRC and framing).
84 indicates that the ethernet framing (160 bits) and CRC (32 bits)
85 will be included in the computation of the packet size.
87 means transmission will occur according to the timestamps
88 recorded in the trace. The optional
90 multiplier (defaults to 1) indicates how much faster
91 or slower than real time the trace should be replayed.
92 .It Fl D Ar dt | Cm constant, Ns Ar dt | Cm uniform, Ns Ar dmin,dmax | Cm exp, Ar dmin,davg
93 Adds additional delay to the packet transmission, whose distribution
94 can be constant, uniform or exponential.
95 .Ar dt, dmin, dmax, avt
96 are times expressed as floating point numbers optionally followed
97 by a character (s, m, u, n) to indicate seconds, milliseconds,
98 microseconds, nanoseconds.
99 The delay is added to the transmit time and adjusted so that there is
100 never packet reordering.
101 .It Fl L Ar x | Cm plr, Ns Ar x | Cm ber, Ns Ar x
102 Simulates packet or bit errors, causing offending packets to be dropped.
104 is a floating point number indicating the packet or bit error rate.
105 .It Fl w Ar wait-link
106 indicates the number of seconds to wait before transmitting.
107 It defaults to 2, and may be useful when talking to physical
108 ports to let link negotiation complete before starting transmission.
112 creates an in-memory schedule with all packets to be transmitted,
113 and then launches a separate thread to take care of transmissions
114 while the main thread reports statistics every second.
116 .Pa http://info.iet.unipi.it/~luigi/netmap/
118 Luigi Rizzo, Revisiting network I/O APIs: the netmap framework,
119 Communications of the ACM, 55 (3), pp.45-51, March 2012
121 Luigi Rizzo, Giuseppe Lettieri,
122 VALE, a switched ethernet for virtual machines,
123 ACM CoNEXT'12, December 2012, Nice
128 .An Luigi Rizzo, Andrea Beconcini, Francesco Mola and Lorenzo Biagini
129 at the Universita` di Pisa, Italy.