On 11/30/2018 9:13 PM, Jesse 1 Robinson wrote:
The reason it's so slow is that it simulates keyboard entry. Not elegant but competent. Not ideal for large files, but here's how I made peace with it long ago.
IND$FILE protocol hasn't simulated true keyboard entry for a long, Long, LONG time.
Any terminal 'ca 1980s supporting EDS (extended data stream) orders will support structured fields. Competent IND$FILE clients *should* use structured fields to send or receive the data rather than the old way, which relied on the character representation of the data being passed through a terminal buffer. Yikes!
Even so, as you say it's slow compared to TCP/IP transfers because it is a half-duplex protocol, there is no coat-tailing or Nagle algorithm, the buffer sizes are not particularly large, and TGET/TPUT and similar 3270 brethren were never designed for speed.
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