[Info-vax] VMS-update NL dec2015 - downloads

[johnson.eric at gmail.com]

On Monday, February 1, 2016 at 7:00:16 AM UTC-5, Neil Rieck wrote:

> 1) In the last presentation (LAN Performance) it is stated that the LAN DRIVER can 
> run at 85% of line rate whilst the TCP/IP only runs at 12% of line rate. 
> Does anyone know why TCP/IP would be so poor because VSI claims 90% is possible.

While I don't have access to the code, as I recall when externally observing the stack, 
there appeared to be a good amount of contention around IOLOCK8. I had also written
my own IP handler that leveraged the VCI interface. It handled enough of the IP protocol
to do a UDP ping/pong style test. If you're careful enough, you can get better latency. But
its not easy. And its still not as good at Linux.

I'm glad to hear that the VCI interface will be evolving. It's much needed.

EJ