Packet Flow in Shadow

Applications Applications Applications

Socket buffers Socket buffers

Sending hosts

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Applications call sendto to place packet in socket buffer If socket buffer is full (-1 returned and errno set to EAGAIN)

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Socket buffers --socket-send-buffer Interface Interface takes packet from socket buffer and places it in discrete event queue

Interface

At rate controlled by bandwidthup

Packets routed to receiving host

Discrete event queue

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At a rate controlled by packetloss

Packets taken from discrete event queue and placed in interface receive buffer

Receiving hosts

Interface receive buffer Interface receive buffer Interface Socket buffers receive buffer --interface-buffer

Socket buffers

If interface receive buffer is full

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Packet taken off interface receive buffer and placed on socket buffer If socket buffer is full

At rate controlled by bandwidthdown

Socket buffers Applications --socket-recv-buffer Applications Applications

Application calls readfrom to receive packet

Rate limiting

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Packet dropping v0.1 (2013-06-14) Steven J. Murdoch

Shadow packet flow - GitHub

Applications call sendto to place packet in socket buffer. Interface takes packet from socket buffer and places it in discrete event queue. Packets taken from ...

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