Blasting UDP packets on a 1-Gbps link

From: Long Le (le_at_unc.edu)
Date: 06/21/04

  • Next message: Yohan: "Re: PPPoE" 
    Date: Mon, 21 Jun 2004 08:19:45 -0400
To: freebsd-net@freebsd.org

    Hi all,

    I've been trying to get iperf to blast UDP packets for 10 minutes on
    a 1-Gbps link. However, iperf stops after a few seconds and complains
    that it can't write to the socket because no buffer space is available.

    'netstat -m' shows that there are lots of mbufs available. I modified
    iperf source code to set the socket's send buffer to 200000 bytes (*)
    but it didn't really help much. In another attempt, I modified iperf
    source code such that it would not quit after failing to write to
    the socket. However, this caused iperf to hang. I use iperf 1.7.0
    and FreeBSD 4.5. The machine I am using has a 1-GHz CPU and 1 Gbytes
    of memory. I could try to write my own program to blast UDP packets
    but would prefer to use available software if possible.

    Has anyone successfully blasted UDP packets on a 1-Gbps link for a
    sustained period and can anyone give me some useful hints?

    Thanks,
    Long

    (*) Apparently, iperf doesn't have an option to set the socket buffer for
    UDP sockets. And there seems to be a limit that doesn't allow to set a
    larger buffer size than around 200000 bytes (this is not related to iperf
    but FreeBSD in general).

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  • Next message: Yohan: "Re: PPPoE"

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