Re: BCM4401 Support for FreeBSD

From: Duncan Barclay (dmlb_at_dmlb.org)
Date: 07/29/03

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    To: "Terry Lambert" <tlambert2@mindspring.com>, "Joe Marcus Clarke" <marcus@marcuscom.com>
Date: Tue, 29 Jul 2003 09:47:36 +0100

    Hello Terry,

    From: "Terry Lambert" <tlambert2@mindspring.com>

    > Joe Marcus Clarke wrote:
    > > On Mon, 2003-07-28 at 12:18, Aeefyu wrote:
    > > > i.e. Broadcom 440x NIC support for FreeBSD 4.x and 5.x (as found on
    > > > latest Dell's Notebooks - mine is a 8500)
    > > >
    > > > Would anyone be so kind to enlighten me on the the current status?
    > > > Last I heard of developments being made was end of June.
    > >
    > > This was forwarded to me from Greg Lehey. The dcm driver works okay for
    > > me, but I had to hack it for some new bus dma changes. I have noticed a
    > > few issues of slowness with it when using it in a more "normal" sense
    > > (i.e. using it to read mail, ssh to machines, etc.).
    >
    >
    > Most likely, the interactive performance is a result of the RX
    > packet coelescing, with a timer set to too long an interval. In
    > general, it's probably an easy adjustment to make.

    It shouldn't be as I set the RX coalescing timer at the same settings as the
    Linux drivers - and it is set to 1 packet.

    > I notice that he also says he didn't know what to add into some
    > of the timer and media routines, so that could be part of the
    > issue as well (e.g. if it's getting wedged and having to unwedge
    > itself).

    Nope - no wedging is going on. It's packet aligment issues - either I'm
    programming the RX DMA pointers wrong or not adjusting them correctly on
    receipt.

    TX is absolutly fine, it can easily max out a 100MB/s link with hardly any
    CPU load.

    > BTW: As a rule of thumb, if you don't know what to put in a timer
    > or media routine, put a printf() there. It will likely annoy
    > someone into fixing it. 8-).

    Ta - will do when the RX issues are fixed.

    > -- Terry
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    >

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