16 Jul
2024
16 Jul
'24
2:49 a.m.
Maybe someone can explain to me why it looks like the buffer size
reported by NCP is 576 when it sounds like you are both setting it to 1476?
Johnny
On 2024-07-15 22:48, Thomas DeBellis wrote:
These are the relevant lines from my
SYSTEM:7-1-CONFIG.CMD:
DECNET BUFFER-SIZE 1476
DECNET MAXIMUM-ADDRESS 1023
NODE VENTI2 2.522
DECNET ROUTER-LEVEL-1
ETHERNET 0 DECNET
The maximum buffer size of 1476 is what I determined from a review of
the relevant code in the monitor, which I commented about, some months
back (but see below).
This is the response from my local excutor (VENTI2::)
OPR>ncp shOW exECUTOR chaRACTERISTICS
Request # 280; Show Executor Node Characteristics Completed
Executor Node = 2.522 (VENTI2)
Identification = Venti Due Test System
Management Version = 4.0.0
CPU = DECSYSTEM1020
Software Identification = Tops-20 7.1 PANDA II
Loop Count = 1
Loop Length = 127
Loop With = Mixed
Incoming Timer = 30
Outgoing Timer = 60
NSP Version = 4.0.0
Maximum Links = 65535
Delay Factor = 48
Delay Weight = 10
Inactivity Timer = 120
Retransmit Factor = 10
Routing Version = 2.0.0
Type = Routing IV
Routing Timer = 600
Broadcast Routing Timer = 40
Maximum Address = 1023
Maximum Circuits = 20
Maximum Cost = 100
Maximum Hops = 16
Maximum Visits = 20
Maximum Broadcast Nonrouters = 64
Maximum Broadcast Routers = 32
Maximum Buffers = 80
Buffer Size = 576
Segment Buffer Size = 576
The buffer size of 576 is what I remember being for non-Ethernet packets
going over an IMP (which I'm sure is irrelevant because this was IP
only). 1500 is the maximum for non-jumbo sized Ethernet frames, the
1476 length being 24 bytes less. I plan to investigate that when I
finally get into the guts of why ERROR.SYS fills up with class 5 errors
from NTMAN for packets being too long.
------------------------------------------------------------------------
On 7/14/24 5:04 AM, Johnny Billquist wrote:
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt(a)softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
Anders...
On 2024-07-14 10:20, Anders Andersson wrote:
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<kropotkin(a)gmx.com> wrote:
Hmm. That do not seem to be the values currently used:
.ncp tell rarity sho exec cha
Node characteristics as of 14-JUL-24 10:58:22
Executor node = 1.802 (RARITY)
Identification = Rarity of Maneframe Six
Management version = 4.0.0
Software identification = DECnet-20 Version 4.0
Loop count = 1, Loop length = 127
Loop with = Mixed
Incoming timer = 30, Outgoing timer = 60
NSP version = 4.0.0
Maximum links = 65535, Delay factor = 48
Delay weight = 10, Inactivity timer = 120
Retransmit factor = 10, Routing version = 2.0.0
Type = Routing IV, Routing timer = 600
Broadcast routing timer = 40
Maximum address = 1023, Maximum circuits = 20
Maximum cost = 100, Maximum hops = 16
Maximum visits = 20, Maximum broadcast endnodes = 64
Maximum broadcast routers = 32, Maximum buffers = 80
Buffer size = 576, Segment buffer size = 576
.
However, also to clarify some things. The segment buffer size should
probably stay at 576. This is basically the size of packets used at
the DECnet level, and I have some vague recollection that nodes should
use the same size, or DECnet might fail. DECnet is not that clever
about different sizes there.
The buffer size on the other hand can be larger (modulo VMS bug that I
mentioned a few days ago), but that would only be used by link layer
protocols, like the routing information packets that are sent, for
example.
But if you are experimenting, please let me know if you figure
something out. Positive or negative. Always good with more information.
Johnny
Any way to set endpoint buffer size on panda
decnet phase IV
Could some of this (in SYSTEM:7-CONFIG.CMD) be what you are looking
for?
This is from RARITY (not PANDA, but DEC vanilla distribution,kind
of), I'm
not sure I have the correct values myself, been experimenting.
; DECnet parameters:
;default is DECNET BUFFER-SIZE 576
decnet buffer-size 1476
;default is DECNET MAXIMUM-BUFFERS 80
;decnet maximum-buffers 40