Setting serial line receive buffer size?

From: Homan, Charles (NE) (Charles.Homan_at_GDC4S.Com)
Date: 05/09/03

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    Date: Fri, 09 May 2003 09:20:22 -0400
To: "'sunmanagers@sunmanagers.org'" <sunmanagers@sunmanagers.org>

    Greetings, colleagues,

    I have a user who wants to tweak his serial port receive buffer "trigger
    point" on a SunBlade 100 running Solaris 8. I'm sort of assuming this is
    possible - even *I* know how to do it on Windows, and that is saying
    something... ;-) Unfortunately, I can't find any info on how to go about it,
    so now I'm starting to wonder if it is indeed possible. I guess I'm also
    assuming that Sun serial ports work the same as PC serial ports - that is,
    that they collect a certain amount of data in a small buffer and then signal
    the processor with an interrupt to come and get the data. I have no idea if
    that is a correct assumption or not.

    Some background: The user is developing an application using PPP over the
    serial port between two SunBlades. The line is connected by two long-haul
    modems which could theoretically be miles apart, but in the lab are about 10
    feet apart. They are trying to FTP over the line, and are seeing 2 minute
    breaks in the connection. That is, FTP transfers some data, stops for two
    minutes, transfers a little more, stops for two more minutes, etc. I have
    to admit that I am not really involved in the diagnosis of this problem, but
    they believe that tweaking the receive buffer will help them out, and I
    would like to be able to tell them how to do that.

    Any help would be appreciated. In the immortal words of Jean Claude van
    Damme, "Teach me." :-)

    Thanks,
    /charles

    ObDisclaimer: These comments are mine and don't necessarily reflect the
    views of my employers.
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