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From: jeffv@bisco.kodak.com (Jeff Van Epps)
Newsgroups: comp.windows.x
Subject: Re: More than 4096 bytes per write to an Xserver on a Sun?
Summary: Yes, setsockopt(2)
Message-ID: <1991Feb18.184330.26090@ssd.kodak.com>
Date: 18 Feb 91 18:43:30 GMT
Sender: news@ssd.kodak.com
Reply-To: jeffv@bisco.kodak.com (Jeff Van Epps)
Followup-To: comp.windows.x
Organization: Eastman Kodak
Lines: 29

In article <1991Feb13.012043.1592@cimage.com> paulh@cimage.com (Paul Haas) writes:
> On a Sun, Sparcstation 1+, running Sun OS 4.1.1 is it possible to
> increase the size of the IPC buffer?

The answer to this specific question is "yes".  I don't know whether or not
it will help you with X communications though.

I work on exactly the same setup, and it was just last Friday that I found
the answer in Stevens' _UNIX Network Programming_ (an excellent book!).
It works on my setup and does increase performance somewhere around 10%.

SendBufferSize = 32768;   /* size in bytes */
if ( setsockopt( fd, SOL_SOCKET, SO_SNDBUF, (char *) &SendBufferSize,
	sizeof( SendBufferSize ) ) < 0 )
		{
		error...
		}

According to the book, the maximum buffer size is 52,000.  I haven't tried
more than 50,000.  You can also change the size of the receive buffer.

From the description of your application, I would guess that you would need
a more effective solution than this.

-- 
If the From: line says nobody@kodak.com, don't believe it.

    Jeff Van Epps          jeffv@bisco.kodak.com
                           rochester!kodak!bisco!jeffv