RE: How do I max a 6Mbps link

From: Simon (simon_at_optinet.com)
Date: 07/09/03

  • Next message: Mykroft Holmes IV: "Re: How do I max a 6Mbps link" 
    To: "freebsd-isp@freebsd.org" <freebsd-isp@freebsd.org>, "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>, "Lapinski, Michael (Research)" <lapinski@crd.ge.com>, "Max Clark" <max.clark@media.net>
Date: Wed, 09 Jul 2003 13:46:53 -0400

    Ops, you're absolutely right, I don't know how I got the 3megs, I'm in the middle
    of getting a mortgage, if you know what I mean. Sorry for any confusion I might
    have caused. I do know my bits and bytes and I was way off indeed, my mistake.

    -Simon

    On Wed, 9 Jul 2003 13:31:54 -0400, Lapinski, Michael (Research) wrote:

    >1) "6mbps link, which is roughly 3megs/sec" is inaccurate
    > 6 Mbits is roughly 600kilobytes/second
    >
    >2) A common way to speed up transfers is to tune your
    > tcp window sizes using /sbin/sysctl.
    > The two you may wish to lok at are:
    > net.inet.tcp.sendspace
    > net.inet.tcp.recvspace
    > try values like 128000 and 256000
    > Doing so so on bnoth machien sshould increase your throughput.
    >
    > A good reference for all the syctl variable is available at
    > http://people.freebsd.org/~adrian/sysctl.descriptions,
    > the freebsd manual may have em soemwhere but i cant recall
    > where.
    >
    >-mtl
    >
    >--------------------------------------------------
    >Michael Lapinski
    >Computer Scientist
    >GE Research
    >
    >
    >"I think there is a world market for maybe five computers."
    > - IBM Chairman Thomas Watson, 1943
    >
    >
    >->-----Original Message-----
    >->From: Simon [mailto:simon@optinet.com]
    >->Sent: Wednesday, July 09, 2003 1:19 PM
    >->To: freebsd-isp@freebsd.org; freebsd-questions@freebsd.org; Max Clark
    >->Subject: Re: How do I max a 6Mbps link
    >->
    >->
    >->
    >->Sounds like you have a problem with your server/network hardware or
    >->firewall/proftpd settings. FreeBSD out of the box on low-end
    >->Intel hardware
    >->can easily sustain 6mbps link, which is roughly 3megs/sec. Make sure
    >->your harddrive on receiving end can write at least this fast
    >->and your network
    >->is capable of such transfers. Sometimes faulty switches/cable
    >->wires can
    >->cause packet loss/delays, causing a bottleneck. It could be a
    >->number of
    >->things, but I would start with testing your network.
    >->
    >->-Simon
    >->
    >->On Wed, 9 Jul 2003 10:12:03 -0700, Max Clark wrote:
    >->
    >->>Hi all,
    >->>
    >->>What configuration changes do I need to make to two
    >->freebsd-stable boxes to
    >->>fully max out a 6Mbps/220ms network link? This is for bulk
    >->500+MB file
    >->>transfers.
    >->>
    >->>The target application is proftpd with ncftpd as the client.
    >->>
    >->>Thanks in advance,
    >->>Max
    >->>
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    >

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