Re: SOS - why does an application work fine with a hub but not a switch box?

From: David Schwartz (davids_at_webmaster.com)
Date: 08/26/03

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    Date: Mon, 25 Aug 2003 17:10:36 -0700
    
    

    "L" <lx2828@sina.com> wrote in message
    news:bie62v$8eu79$1@ID-92003.news.uni-berlin.de...

    > (1) When we connect the target machine with the host machine by using a
    > network hub, the throughput between the target and the host is around
    > 9.5MB/sec, which has saturated the bandwidth of the 10/100 port (this is
    > good and what we expected).
    >
    > (2) When we connect both the target and the host machines by using a
    switch
    > box, the throughput drops to 2MB/sec.
    >
    > (3) When we connect both the target and the host machines directely by
    using
    > a crossover Ethernect cable, the throughput is around 1.5MB/sec.
    >
    > What could be wrong with it? Do we need to modify the original Linux
    kernel
    > Ethernet supporting files, or do we need to setup something? We have
    tried
    > different switch boxes with different setups (e.g. turn on port fast,
    etc.),
    > but didn't get any improvement.

        Try locking all endpoints to the appropriate duplex settings. This
    sounds like a negotiation problem.

        DS


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