Tag: tuning

Iperf, un tool per misurare la banda

Iperf è uno strumento per misurare l’ampiezza di banda su TCP, abbastanza flessibile, open source e disponibile per diversi sistemi operativi.

Ecco le caratteristiche:

  • TCP
    • Measure bandwidth
    • Report MSS/MTU size and observed read sizes.
    • Support for TCP window size via socket buffers.
    • Multi-threaded if pthreads or Win32 threads are available. Client and server can have multiple simultaneous connections.
    UDP
    • Client can create UDP streams of specified bandwidth.
    • Measure packet loss
    • Measure delay jitter
    • Multicast capable
    • Multi-threaded if pthreads are available. Client and server can have multiple simultaneous connections. (This doesn’t work in Windows.)
    Where appropriate, options can be specified with K (kilo-) and M (mega-) suffices. So 128K instead of 131072 bytes. Can run for specified time, rather than a set amount of data to transfer. Picks the best units for the size of data being reported. Server handles multiple connections, rather than quitting after a single test. Print periodic, intermediate bandwidth, jitter, and loss reports at specified intervals. Run the server as a daemon. Run the server as a Windows NT Service Use representative streams to test out how link layer compression affects your achievable bandwidth. A library of useful functions and C++ classes.

    Permette di controllare l’effetto della variazione di diversi parametri tipo la TCP windows size o l’MTU, supporta IPV6 e ha diverse opzioni per girare come demone o servizio.

    Senza scendere in usi troppo esoterici è utile per controllare la banda a disposizione tra due siti connessi via WAN e/o VPN. L’uso più semplice è lanciare Continua a leggere