[HECnet] Thousands of DECnet errors on Tops-20

[Thomas DeBellis]

Unfortunately, in all the monitor sources, I only see the abbreviation 
'DDP', no spelling out of what it is or what it does.  I didn't 
immediately find an obvious driver.

Under the Tops-10 SMP conditional, checking is done as to whether a 
particular device can be used, depending on what physical processor it 
is actually connected to. If the processor doesn't own the circuit, then 
the request is queued up for the processor that does.  The sole case is 
a DDP, which is apparently not CPU dependent.

I have no idea what that could be.

> ------------------------------------------------------------------------
> On 1/15/21 4:53 PM, Peter Lothberg wrote:
>
> The 2020 has a KMC11 and up to 2 DUP11, and those are the interfaces
> the "MRC T20 DECnet thing supports.
>
> On the list of devices/sizes you posted is  a "DDP" device and I wounder
> if you knew what that is?
>
> --P
>
> ------------------------------------------------------------------------
>
>     *From: *"tommytimesharing" <tommytimesharing at gmail.com>
>     *To: *"hecnet" <hecnet at Update.UU.SE>
>     *Sent: *Friday, January 15, 2021 4:24:07 PM
>     *Subject: *Re: [HECnet] Thousands of DECnet errors on Tops-20
>
>     DDP?  I thought it was DUP-11.
>
>         ------------------------------------------------------------------------
>         On 1/15/21 4:21 PM, Peter Lothberg wrote:
>
>         Well, MRC was receiving "suggestions" from Stu Grossman on how
>         to do it, but
>         if my memory does not fail me the block size was 312, due to
>         lack of buffer space
>         in the already crammed single section 512KW 2020. I'm afraid
>         my tape and disk-pack
>         are in Seattle. I knew it was not 576 as it had two DUP-11's
>         and using it for transit failed...
>
>         Quiz, do you knew what a DDP is?
>
>         -P
>
>
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