Date: Tue, 6 Apr 2004 11:00:20 -0700 From: Mike Hunter <mhunter@ack.Berkeley.EDU> To: freebsd-net@freebsd.org Subject: Broadcom BCM5788 jumbo frames? (FBSD 5.2.1) Message-ID: <20040406180020.GA21071@ack.Berkeley.EDU>
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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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