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    SubjectRe: NIU - Sun Neptune 10g - Transmit timed out reset (2.6.24)
    Matheos Worku wrote:
    > 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?

    I wouldn't say it is easy either.. I have never got it before getting a
    few TB over the "wire". I've got proto=tcp in /proc/mounts for the
    mountpoints, so I'd assume that I use TCP.

    There is an Extreme Networks switch in the other end, I havent got
    hardware to actually test that with a different card, so I cannot rule
    the switch out either. .. but it would be strange.


    Jesper
    --
    Jesper


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