Message-ID: <32FA6365.5C3D@dtechs.com>
Date: Thu, 06 Feb 1997 17:04:05 -0600
From: Mark Teel <mteel AT dtechs DOT com>
MIME-Version: 1.0
To: djgpp AT delorie DOT com
Subject: Re: DJ-WATTCP
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Paul Dixon wrote:

>I have a bizarre problem - on my PC (P90 with a D-Link 16 bit ISA >netcard) I
>get tx rates of 300kB/s inbound, and 250kB/s outwards, but ONLY with
>debugging output to the screen at every tcp write - if I disable these
>printf statements then the tx rate for tcp writes drops by a factor of >20!

>The offending code is horrible cos I have thrown lots of debugging >waiting
>etc in an attempt to fix but to no avail - does anyone have any good >ideas ?

Sounds like your data is getting buffered, but without seeing write_s
and probably the rest of your code, I can't be sure.  You should have
better tx rates than that on a 10Mb Ethernet link unless you are on a
very busy network... The screen I/O is probably slowing it down some. 
But it sounds like the printfs are causing your socket to get flushed
out...  If I have time, I'll take a look at your code.

MST