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networks

Tags: Computers

Wireless networks

https://cse.sc.edu/~sur/papers/UbiG_MobiCom18.pdf

Outages

Tofu networks for supercomputing

linux Monitoring with Pcap

Cache Line optimization for cpu

TCP Congestion Control

  • slow start - begins transmission with a small congestion window and exponetnially increases it until a threshold is reached or packet loss is detected
  • congestion avoidance - once a threshold is reached, TCP increases the congestion window linearly to probe for additional bandwidth
  • fast retransmist and fast recovery - if packet loss is detected via duplicate acks, then it performs a fast retransmit
  • Sequence number wrapping - TCP must handle the sequence number wrapping around

Nagle’s Algorithm

  • 40ms delay in TCP
  • Basically a buffer
  • Note that TCP defaults haven’t really changed!
  • Set TCP_NODELAY to prevent it

Route Map