TOUR Transition Release Notes (September 2004)(11i v1 and 11i v2)

Transport Optional Upgrade Release Transition Release Notes

Features and Enhancements in the STREAMS Transition Patch

Features and Enhancements in the STREAMS Transition

Patch

The STREAMS transition patch contains features and enhancements for HP-UX STREAMS

on HP-UX 11i v1 and HP-UX 11i v2 September 2004.

HP-UX STREAMS NOSYNC Enhancement

In previous STREAMS releases, one execution of the put procedure of a given queue is

supported at a time. When there are multiple requests to the same queue, the STREAMS

framework synchronizes the requests depending on the synchronization level of a module.

Synchronization ensures that only one request will be executed at a time. With high speed

I/O, the synchronization limits imposed by STREAMS may lead to a performance bottleneck.

The STREAMS transition patches lift the restriction imposed by the previous STREAMS

synchronization methods. This is done by providing a new synchronization method referred to

as NOSYNC. This feature allows multiple instances of a put procedure for a given queue, as

well as the service routine for that queue, to run concurrently. Modules and drivers are

responsible for synchronizing access to their own private data structures accordingly.

To realize the NOSYNC performance gain, all the modules (i.e. IPFilter and DLPI) between IP

and the LAN driver must also be NOSYNC enabled. Install the following products before or

along with the transition patches if your networking environment uses IPFilter and DLPI,

and you want to realize NOSYNC performance gain:

• IPFilter A.03.05.14 or later

• DLPI patch PHNE_33704 (or later) for HP-UX 11i v1

• DLPI patch PHNE_33429 (or later) for HP-UX 11i v2 September 2004

Table 3 STREAMS Enhancement

Transition

Patch

Transport Enhancement HP-UX Version

TOUR

Version

PHNE_35453 HP-UX STREAMS NOSYNC

Enhancement

11i v1 3.0

PHNE_34788 11i v2 September

2004

3.0