Mark Bixby wrote:

>The POSIX shell sh.hpbin.sys seems to run 30 times slower over a VT
>network connection as compared to a telnet connection or serial
>connection, even though the shell script being executed isn't doing
>terminal I/O.

I don't know if you've heard back from the RC, but I encountered this in
an application that regularly re-enabled control-Y (FCONTROL 17) during
processing. The application did this in order to insure that the corner
cases where Control-Y is disabled without an interrupt wouldn't get in
the way.

The FCONTROL 17 is processed locally for serial and telnet connections,
but must be sent to the terminal or remote session under VT. (This is
because VT handles control-Y as a separate host transaction, not just a
character.) Thus, applications that try to insure that control-Y always
works will run much more slowly over VT, especially using VT over a slow
network link. Running the application using a network analyzer or over a
modem line where you can watch the TX/RX LEDs should help to diagnose
this case.

-- Bruce


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