Subject: Re: [rddp] A consensus call and a poll

From: Caitlin Bestler <[email-masked]>
Date: Wed, 15 Jan 2003 10:22:25 -0600

On 12/16/02, [email-masked] wrote:

>(1) Having seen no defenders of a prohibition on packing
>   multiple ULPDUs into a TCP segment, I believe the
>   rough consensus of the RDDP WG that packing of
>   multiple ULPDUs into a TCP segment MUST be supported.
>   Anyone who disagrees should post that fact to the list
>   along with a technical rationale.

There is one detail here that still has to be specified.
When there are multiple ULPDUs between two markers, the
marker should refer to the *first* one. The extra ULPDUs
must be found by adding the length of the prior ULPDU.

There are at least two scenarios where you could get a
burst of very short DDP segments:

- A series of short tagged DDP puts where the Data Sinks'
  buffer space was being used to form a join image. [The
  Data Source does not have the records requested organized
  as such anywhere in its memory].
  
- A series of short untagged DDP messages, perhaps flushing
  a large number of pending requests due to an orderly
  shutdown of a session.

Caitlin Bestler
http://asomi.com/CaitlinBestler/
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