[Info-vax] Networking Benchmarks

[Craig A. Berry]

On 9/17/19 9:08 AM, johnson.eric at gmail.com wrote:
> On Friday, September 13, 2019 at 12:35:57 PM UTC-4, Bill Gunshannon wrote:
> 
>> Has anyone ever done any benchmarking of TCPIP vs. DECNET under
>> VMS?  It seems that there should be less overhead and therefore
>> greater throughput using DECNET.
> 
> I believe your greatest bottleneck will be the
> amount of time it takes to shovel ethernet
> frames through the underlying machinery that
> is shared in common. So it's not about
> TCPIP vs DECNET. It's about what kind
> of performance do non VMS systems see with
> their networking gear vs. what VMS systems see.
> 
> As I believe you will see, VMS falters here.

After remembering your earlier posts on this topic, I was wondering the
same.  On the one hand, I don't know if DECNET has the packet processing
engine or equivalent, but on the other hand, it appears that DECNET IV
may not use VCI, but DECNET V does, and VCI has been cited as one of the
bottlenecks for TCP/IP.  What little I know I have gleaned from the
slides here:

<https://www.connect-community.de/drupal/sites/default/files/10%20LAN%20Performance%20Improvements.pdf>

but it's hard to know what to make of those slides without more context.
VCI 2.0 has disappeared from the Roadmap in the last two years, but it
does still say something about LAN improvements in OpenVMS v9.2, which
may or may not be the same thing.