[HECnet] Emulated XQ polling timer setting and data overrun

[Paul_Koning at Dell.com]

On Jun 5, 2014, at 12:47 PM, Johnny Billquist <bqt at softjar.se> wrote:

...
It don't. Believe me, I've seen this, and investigated it years ago.
When you have a real PDP-11 running on half-duplex 10Mb/s talking to something on a 1GB/s full duplex, the PDP-11 simply can't keep up.

Makes sense.   The issue isn   t the 10 Mb/s Ethernet.   The switch deals with that part.   The issue is that a PDP-11 isn   t fast enough to keep up with a 10 Mb/s Ethernet going flat out.   If I remember right, a Unibus is slower than Ethernet, and while a Q22 bus is slightly faster and could theoretically keep up, a practical system cannot.

	paul