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    SubjectRe: NIU - Sun Neptune 10g - Transmit timed out reset (2.6.24)
    David Miller wrote:

    >From: Matheos Worku <Matheos.Worku@Sun.COM>
    >Date: Thu, 29 May 2008 17:14:29 -0700
    >
    >
    >
    >>Actually what I am suggesting was a workaround for the lack of "TX Ring
    >>Empty" interrupt by not relying on the TX interrupt at all.
    >>
    >>
    >
    >Ahh I see.
    >
    >Some of the things I talked about in my presentation here in
    >Berlin at LinuxTAG yesterday can help mitigate the effects.
    >Most of it revolves around batching, and allowing the driver
    >to manage the backlog of packets directly when the TX queue
    >fills up.
    >
    >In such a case we could batch the TX queue refill, know how many more
    >TX packets we will queue up to the chip right now, and therefore know
    >that we can safely set periodic MARK bits and only need to force set
    >the MARK bit at the very end.
    >
    >
    >
    >>As for the TX hang, I will try to reproduce the problem and look at
    >>the registers for the clue.
    >>
    >>
    Have been trying but not able to reproduce the timeout. I am using NFS
    V3 with TCP. Are you using UDP by any chance?

    Regards
    Matheos

    >
    >Thanks a lot.
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