Home page logo

nanog logo nanog mailing list archives

Re: Caps (was Re: AT&T UVERSE Native IPv6, a HOWTO)
From: Larry Sheldon <LarrySheldon () cox net>
Date: Mon, 09 Dec 2013 00:12:27 -0600

On 12/8/2013 11:48 PM, Jay Ashworth wrote:
----- Original Message -----
From: "Dave Crocker" <dhc2 () dcrocker net>

I seem to recall an early bit of research on interactive computing
(maybe by Sackman) that showed user preference for a /worse/ average
response time that was more predictable (narrower range of variance)
than a better average time that was more erratic.

Very specifically:

A 3270 that took 5 seconds of delay and then *snapped* the entire screen
up at once was perceived as "faster" than a 9600 tty that painted the same
entire screen in about a second and a half or so.  Don't remember who it
was either, but likely Bell Labs.

Back in the day we were building a system to run on UNIVAC equipment but some brainiac decided that because we were a Bell System company, we had to use DataSpeed 40's (which buffered the screen and snap it up when the last character is received) instead of the UTS terminals on which the system was developed (which painted each character as it came in.

Users weeped and wailed to no effect that the change hurt them badly (which they could prove) because that while the two had the same time from first character to last, the operators could not start composing a reply when the first several lines had painted.

Requiescas in pace o email           Two identifying characteristics
                                        of System Administrators:
Ex turpi causa non oritur actio      Infallibility, and the ability to
                                        learn from their mistakes.
                                          (Adapted from Stephen Pinker)

  By Date           By Thread  

Current thread:
  • Re: Caps (was Re: AT&T UVERSE Native IPv6, a HOWTO) Larry Sheldon (Dec 09)
[ Nmap | Sec Tools | Mailing Lists | Site News | About/Contact | Advertising | Privacy ]