Broadcom BCM5788 jumbo frames? (FBSD 5.2.1)

From: Mike Hunter (mhunter_at_ack.Berkeley.EDU)
Date: 04/06/04

  • Next message: Ignacio Laguna: "kernel: Limiting icmp" 
    Date: Tue, 6 Apr 2004 11:00:20 -0700
To: freebsd-net@freebsd.org

    Hi,

    I have a Broadcom BCM5788 card that I'd like to use with jumboframes, but
    it seems that the card (or the driver) only allows a max of 1500 MTU.

    ifconfig bge0 mtu 9000
    ifconfig: ioctl (set mtu): Invalid argument

    1500 and less works.

    I had this problem with my BCM5707M, and lo and behold if you look in
    if_bge.c it says it can't do it, but I looked and I can't find a similar
    comment for the BCM5788.

    Any thoughts? The system in question is 5.2.1-RELEASE-p3. The bge card
    is builtin to the motherboard (shuttle sb75g2 on 64 bit pci.)

    While I have everybody's attention, what's a reasonable goal for
    throughput between two of these cards? I broke through the 33mhz pci
    barrier and am now getting iperf results of:

    [ 6] 0.0-10.0 sec 535 MBytes 449 Mbits/sec

    ( Obviously, without jumbo frames.)

    I've increased the tcp send and recv space....Any other suggestions?

    Thanks,

    Mike
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  • Next message: Ignacio Laguna: "kernel: Limiting icmp"

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