Patch Name: PHCO_30544

Patch Description: s700_800 11.11 Pthread enhancement and fixes

Creation Date: 04/04/13

Post Date: 04/06/01

Hardware Platforms - OS Releases:
	s700: 11.11
	s800: 11.11

Products: N/A

Filesets:
	OS-Core.C-MIN-32ALIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP
	OS-Core.C-MIN-64ALIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP
	OS-Core.CORE-64SLIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP
	OS-Core.CORE-SHLIBS,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP
	ProgSupport.PAUX-ENG-A-MAN,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP

Automatic Reboot?: No

Status: General Release

Critical:
	No (superseded patches were critical)
	PHCO_29960: HANG
	PHCO_29109: HANG
		Some customers reported seeing the hang every few
		hours of operation.
	PHCO_27632: HANG
	PHCO_25751: ABORT
	PHCO_25226: OTHER
		Performance degradation and sudden increase in
		CPU utilization due to mutex contention.

Category Tags:
	defect_repair enhancement general_release critical
	halts_system manual_dependencies

Path Name: /hp-ux_patches/s700_800/11.X/PHCO_30544

Symptoms:
	PHCO_30544:
	( SR:8606316171 CR:JAGae78888 )
	The performance of pthread_getspecific() needs to be
	improved.

	PHCO_29960:
	( SR:8606334892 CR:JAGae95970 )
	Under certain circumstances, a multi-threaded application
	that has a thread suspending itself while depending upon a
	different thread to resume it, could experience a hang.

	PHCO_29109:
	( SR:8606287920 CR:JAGae51853 )
	Java processes can hang occasionally.

	( SR:8606307157 CR:JAGae70190 )
	Thread can get cancelled even though cancellation is
	disabled.

	( SR:8606307489 CR:JAGae70522 )
	The pthread library does not export two functions that are
	useful to the Java virtual machine.

	PHCO_27632:
	( SR:8606259440 CR:JAGae23758 )
	Unexpected failure of thread cancellation may cause
	application to hang.

	( SR:8606269542 CR:JAGae33777 )
	Enhancement:This product update is a member of a set
	needed to enable a new mutex type which can be
	unlocked by a thread other than the owner. The full
	list of product updates required for the feature are
	PHCO_27632 and PHCO_27633.
	These product updates can be installed in any order.
	If any of these product updates are not installed,
	this product update will have no impact on your
	system.

	( SR:8606269545 CR:JAGae33780 )
	pthread_mutex_destroy() takes longer to destroy a
	mutex, when the mutex is operating in handoff
	disabled mode.

	PHCO_26466:
	( SR:8606226668 CR:JAGad95731 )
	pthread_mutex_destroy() intermittently returns
	EBUSY even when there are no threads  accessing the mutex.

	( SR:8606231620 CR:JAGae00858 )
	Enhancement:  This product update is a member of a set
	needed to enable "Release mode" functionality for
	PTHREAD_PROCESS_SHARED mutexes.
	The full list of product updates required for this feature
	are: PHKL_26467, PHKL_26468, PHKL_26469 and PHCO_26466.
	If any member of this set of product updates is not
	installed, this product update will have no impact on
	your system.

	PHCO_25751:
	( SR:8606226436 CR:JAGad95505 )
	Pthread internal error is reported and core is dumped
	Error message : "__pthread_startup: can't enable gang
	scheduling".

	( SR:8606232147 CR:JAGae01383 )
	Software providers may observe performance deficiencies in
	applications which heavily use shared mutexes.  Performance
	of a PTHREAD_PROCESS_SHARED mutex unlock operation is slower
	than that of a PTHREAD_PROCESS_PRIVATE mutex, even in the
	non-contended (i.e., no waiters) case.
	The full list of product updates required for this feature
	are: PHKL_26316, PHKL_26240, and PHCO_25751.
	If any member of this set of product updates is not
	installed, this product update will have no impact on your
	system.

	PHCO_25226:
	( SR:8606186378 CR:JAGad55582 )
	Heavy mutex contention seen when large number of
	threads try to acquire a single mutex lock, leading
	to performance degradation and sudden jump in CPU
	utilization.

	PHCO_24584:
	( SR:8606200799 CR:JAGad69975 )
	This patch is a member of a set of patches needed to enable
	the HP-UX Processor Sets product (PROCSETS). When PROCSETS
	product is installed, it will install the full set of
	required patches for that product, including this patch.

	If the HP-UX Processor Sets product is not installed, this
	change will have no impact on your system.

	PHCO_23846:
	( SR:8606184540 CR:JAGad53747 )
	This enhancement is to support initialized tls support for
	Fortran OpenMP. Changes are made in pthread library.

Defect Description:
	PHCO_30544:
	( SR:8606316171 CR:JAGae78888 )
	The performance of Thread Specific Data interfaces like
	pthread_getspecific(), is not upto the mark because the
	error checking is not done in an efficient manner.

	Resolution:
	Code changes are done to improve the performance of Thread
	Speicific data interfaces like pthread_getspecific(), by
	doing the error checking in an efficient manner.

	PHCO_29960:
	( SR:8606334892 CR:JAGae95970 )
	Pthread library keeps track of thread suspensions using
	internal suspend count, Suspend count is incremented when
	a thread gets suspended and decremented when thread is
	resumed. The problem occurs when a thread suspends itself
	inside a loop while waiting for a different thread to
	resume it. The thread suspending itself may never get
	resumed since the suspend count maintained inside the
	library will not match the actual suspension state of
	the thread.

	Resolution:
	The internal counter that maintains thread's suspend
	count has been fixed to avoid this situation.

	PHCO_29109:
	( SR:8606287920 CR:JAGae51853 )
	During normal operation, the Java Virtual Machine may
	suspend a thread.  When a thread gets suspended, it
	could be holding internal pthread resources. This can
	cause a deadlock.

	Resolution:
	Solution is to ensure target does not get suspended while
	holding internal pthread resources

	( SR:8606307157 CR:JAGae70190 )
	The cancellation operation (pthread_cancel) can race with
	cancel enable/disable (pthread_setcancelstate).

	Resolution:
	While cancelling a thread, detect that the thread has now
	disabled cancellation.

	( SR:8606307489 CR:JAGae70522 )
	The pthread library does not export two functions that are
	useful to the Java virtual machine.

	Resolution:
	libpthread will now export the two symbols

	PHCO_27632:
	( SR:8606259440 CR:JAGae23758 )
	There is a race condition in thread cancellation path in
	pthread library. This may cause an application  to fail to
	cancel a thread.

	Resolution:
	The race condition in the thread cancellation path is
	removed by appropriate protection of the internal
	cancellation structure.

	( SR:8606269542 CR:JAGae33777 )
	This enhancement provides a way to restart mutex
	operation when a process owning a mutex terminates
	abnormally.

	Resolution:
	This enhancement provides a new mutex type
	PTHREAD_MUTEX_NO_OWNER_NP, which can be unlocked by a
	thread other than the owner.

	( SR:8606269545 CR:JAGae33780 )
	There is a race in mutex destroy and mutex unlock
	operation, which may occassionally result in
	pthread_mutex_destroy() returning EBUSY on first
	try.

	Resolution:
	The race condition in mutex unlock and mutex destroy
	operation is eliminated by better handling of waiter
	count updation.

	PHCO_26466:
	( SR:8606226668 CR:JAGad95731 )
	The problem with pthread_mutex_destroy() is attributed
	to the fact that, pthread_mutex_unlock() does not keep
	track of the number of waiters accurately. The mutex
	cannot be destroyed when there are waiters,
	and hence EBUSY is returned by pthread_mutex_destroy().

	Resolution:
	The change introduced in this patch update will
	accurately keep track of all the waiters.

	( SR:8606231620 CR:JAGae00858 )
	This product update enables enable
	"Release mode" functionality for PTHREAD_PROCESS_SHARED
	mutexes.  "Release mode" for PTHREAD_PROCESS_SHARED
	mutexes is a feature that can be used to increase the
	performance of the mutex in some cases where
	there is high contention for the mutex.
	Previously all shared mutexes use a "handoff"
	mechanism to operate on mutexes whereby a mutex
	lock is never really released, but rather handed
	over to the highest priority waiter, if any.
	This was done to adhere to standards whereby a
	low priority thread shall not acquire the mutex
	when there is a higher priority POSIX realtime
	thread waiting for the same mutex.  This made
	the protocol less efficient in some cases since
	another running thread could acquire and release
	the mutex interim, hence making progress.  This
	enhancement still uses the original "handoff"
	mechanism as the default case, but allows the
	selection of "Release mode" to turn off the
	"handoff" mechanism if it is desired.

	Resolution:
	This product update employs the kernel
	support delivered in PHKL_26467, PHKL_26468 and PHKL_26469
	for enabling release mode for PTHREAD_PROCESS_SHARED
	mutexes.  The changes can be enabled either by using
	the API (pthread_mutex_disable_handoff_np() or
	pthread_mutexattr_disable_handoff_np()) or by
	setting the environment variable
	PTHREAD_DISABLE_HANDOFF=ON. Applications will not
	adhere to real-time semantics if this functionality
	is enabled, however it can avail the performance
	benefits provided by this product update.

	PHCO_25751:
	( SR:8606226436 CR:JAGad95505 )
	The gang scheduler is currently supported only in Default
	pset,so the request to enable gang scheduling for a process
	in non-default pset would fail. The pthread library does not
	recognize this scenario, and it fails the startup of new
	application.

	Resolution:
	The pthread_startup() function needs to bypass the gang
	scheduling requests for processes in non-default psets.

	( SR:8606232147 CR:JAGae01383 )
	In the PTHREAD_PROCESS_SHARED mutex case, the unlock
	operation always makes a system call to synchronize with
	threads in other processes which may be waiting for the
	mutex.  This makes the code path significantly longer.

	Resolution:
	Change pthread_mutex_unlock(), in the case of a shared
	mutex, to call a new light weight system call rather than
	the existing system call.  If that new system call is not
	available, then use the regular system call instead.
	(PHKL_26316, also required for this enhancement,
	adapts the existing system call which handles waiters of
	shared mutexes to coordinate with the light weight unlock
	system call. PHKL_26240, also required for this
	enhancement, provides the new light weight system call
	for shared mutex unlock.)

	PHCO_25226:
	( SR:8606186378 CR:JAGad55582 )
	When large number of threads contend for a single
	mutex, there is lot of contention for the internal
	locks used in the library. This results in
	unnecessary yielding and sleeping by the waiters
	preventing the lock owner to complete the job.

	Resolution:
	Modified existing implementation to reduce contention
	and dependency on the internal lock.

	PHCO_24584:
	( SR:8606200799 CR:JAGad69975 )
	This patch contains minor enhancements in pthreads library
	to support the HP-UX Processor Sets product.

	Resolution:
	Enhancements added to support new pthread_pset_bind_np()
	interface in pthreads library when Processor Sets product
	is enabled.

	PHCO_23846:
	( SR:8606184540 CR:JAGad53747 )
	This is an enhancement for Initialized Thread local storage
	support for Fortran OpenMP.

	Resolution:
	Libpthread allocates memory for TLS and it is initialized
	to zero. With new enhancement the allocated TLS memory will
	be initialized with the initialization image for each load
	module the pointer to which is passed by libc/linker.

Enhancement:
	Yes
	PHCO_30544:
		This change provides better performance for
		thread specific data interfaces like
		pthread_getspecific().

	PHCO_27632:
		The new mutex type PTHREAD_MUTEX_NO_OWNER_NP.

		Additional enhancements were delivered in a patch
		this one has superseded.  Please review the Defect
		Description text for more information.

SR:
	8606184540 8606186378 8606200799 8606226436 8606226668
	8606231620 8606232147 8606259440 8606269542 8606269545
	8606287920 8606307157 8606307489 8606316171 8606334892

Patch Files:
	
	OS-Core.C-MIN-32ALIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
	/usr/lib/libpthread.a
	/usr/lib/libpthread_tr.a

	OS-Core.C-MIN-64ALIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
	/usr/lib/pa20_64/libpthread.a
	/usr/lib/pa20_64/libpthread_tr.a

	OS-Core.CORE-64SLIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
	/usr/lib/pa20_64/libpthread.1
	/usr/lib/pa20_64/libpthread_tr.1

	OS-Core.CORE-SHLIBS,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
	/usr/lib/libpthread.1
	/usr/lib/libpthread_tr.1

	ProgSupport.PAUX-ENG-A-MAN,fr=B.11.11,
		fa=HP-UX_B.11.11_32/64,v=HP:
	/usr/share/man/man3.Z/pthread_ldom_bind_np.3t
	/usr/share/man/man3.Z/pthread_ldom_id_np.3t
	/usr/share/man/man3.Z/pthread_num_ldomprocs_np.3t
	/usr/share/man/man3.Z/pthread_num_ldoms_np.3t
	/usr/share/man/man3.Z/pthread_num_processors_np.3t
	/usr/share/man/man3.Z/pthread_processor_bind_np.3t
	/usr/share/man/man3.Z/pthread_processor_id_np.3t
	/usr/share/man/man3.Z/pthread_pset_bind_np.3t
	/usr/share/man/man3.Z/pthread_spu_to_ldom_np.3t

what(1) Output:
	
	OS-Core.C-MIN-32ALIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
	/usr/lib/libpthread.a:
		specific.c $Date: 2004/03/03 03:30:19 $Revision: r11
			.11/1 PATCH_11.11 (PHCO_30544)
		pthread.c $Date: 2004/03/03 03:31:45 $Revision: r11.
			11/3 PATCH_11.11 (PHCO_30544)
		Pthread Interfaces
		$Revision: libpthread.a:    @(#) depot-32pa R11.11_B
			L2004_0413_6 PATCH_11.11 PHCO_30544 Tue Apr 
			13 22:33:15 PDT 2004 $
	/usr/lib/libpthread_tr.a:
		specific.c $Date: 2004/03/03 03:30:19 $Revision: r11
			.11/1 PATCH_11.11 (PHCO_30544)
		pthread.c $Date: 2004/03/03 03:31:45 $Revision: r11.
			11/3 PATCH_11.11 (PHCO_30544)
		Pthread Interfaces
		$Revision: libpthread_tr.a:    @(#) depot-32pa R11.1
			1_BL2004_0413_6 PATCH_11.11 PHCO_30544 Tue A
			pr 13 22:33:31 PDT 2004 $

	OS-Core.C-MIN-64ALIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
	/usr/lib/pa20_64/libpthread.a:
		specific.c $Date: 2004/03/03 03:30:19 $Revision: r11
			.11/1 PATCH_11.11 (PHCO_30544)
		pthread.c $Date: 2004/03/03 03:31:45 $Revision: r11.
			11/3 PATCH_11.11 (PHCO_30544)
		Pthread Interfaces
		$Revision: libpthread.a:    @(#) depot-64pa R11.11_B
			L2004_0413_6 PATCH_11.11 PHCO_30544 Tue Apr 
			13 22:35:57 PDT 2004 $
	/usr/lib/pa20_64/libpthread_tr.a:
		specific.c $Date: 2004/03/03 03:30:19 $Revision: r11
			.11/1 PATCH_11.11 (PHCO_30544)
		pthread.c $Date: 2004/03/03 03:31:45 $Revision: r11.
			11/3 PATCH_11.11 (PHCO_30544)
		Pthread Interfaces
		$Revision: libpthread_tr.a:    @(#) depot-64pa R11.1
			1_BL2004_0413_6 PATCH_11.11 PHCO_30544 Tue A
			pr 13 22:36:12 PDT 2004 $

	OS-Core.CORE-64SLIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
	/usr/lib/pa20_64/libpthread.1:
		Pthread Interfaces
		$Revision: libpthread.1:    @(#) depot-64pa R11.11_B
			L2004_0413_6 PATCH_11.11 PHCO_30544 Tue Apr 
			13 22:34:41 PDT 2004 $
		specific.c $Date: 2004/03/03 03:30:19 $Revision: r11
			.11/1 PATCH_11.11 (PHCO_30544)
		pthread.c $Date: 2004/03/03 03:31:45 $Revision: r11.
			11/3 PATCH_11.11 (PHCO_30544)
	/usr/lib/pa20_64/libpthread_tr.1:
		Pthread Interfaces
		$Revision: libpthread_tr.1:    @(#) depot-64pa R11.1
			1_BL2004_0413_6 PATCH_11.11 PHCO_30544 Tue A
			pr 13 22:34:56 PDT 2004 $
		specific.c $Date: 2004/03/03 03:30:19 $Revision: r11
			.11/1 PATCH_11.11 (PHCO_30544)
		pthread.c $Date: 2004/03/03 03:31:45 $Revision: r11.
			11/3 PATCH_11.11 (PHCO_30544)

	OS-Core.CORE-SHLIBS,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
	/usr/lib/libpthread.1:
		specific.c $Date: 2004/03/03 03:30:19 $Revision: r11
			.11/1 PATCH_11.11 (PHCO_30544)
		pthread.c $Date: 2004/03/03 03:31:45 $Revision: r11.
			11/3 PATCH_11.11 (PHCO_30544)
		Pthread Interfaces
		$Revision: libpthread.1:    @(#) depot-32pa R11.11_B
			L2004_0413_6 PATCH_11.11 PHCO_30544 Tue Apr 
			13 22:31:36 PDT 2004 $
	/usr/lib/libpthread_tr.1:
		specific.c $Date: 2004/03/03 03:30:19 $Revision: r11
			.11/1 PATCH_11.11 (PHCO_30544)
		pthread.c $Date: 2004/03/03 03:31:45 $Revision: r11.
			11/3 PATCH_11.11 (PHCO_30544)
		Pthread Interfaces
		$Revision: libpthread_tr.1:    @(#) depot-32pa R11.1
			1_BL2004_0413_6 PATCH_11.11 PHCO_30544 Tue A
			pr 13 22:31:56 PDT 2004 $

	ProgSupport.PAUX-ENG-A-MAN,fr=B.11.11,
		fa=HP-UX_B.11.11_32/64,v=HP:
	/usr/share/man/man3.Z/pthread_ldom_bind_np.3t:
		None
	/usr/share/man/man3.Z/pthread_ldom_id_np.3t:
		None
	/usr/share/man/man3.Z/pthread_num_ldomprocs_np.3t:
		None
	/usr/share/man/man3.Z/pthread_num_ldoms_np.3t:
		None
	/usr/share/man/man3.Z/pthread_num_processors_np.3t:
		None
	/usr/share/man/man3.Z/pthread_processor_bind_np.3t:
		None
	/usr/share/man/man3.Z/pthread_processor_id_np.3t:
		None
	/usr/share/man/man3.Z/pthread_pset_bind_np.3t:
		None
	/usr/share/man/man3.Z/pthread_spu_to_ldom_np.3t:
		None

cksum(1) Output:
	
	OS-Core.C-MIN-32ALIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
	2143915840 228486 /usr/lib/libpthread.a
	984320533 258058 /usr/lib/libpthread_tr.a

	OS-Core.C-MIN-64ALIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
	1499812349 434844 /usr/lib/pa20_64/libpthread.a
	356919874 488614 /usr/lib/pa20_64/libpthread_tr.a

	OS-Core.CORE-64SLIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
	1685769992 174312 /usr/lib/pa20_64/libpthread.1
	2350010850 208040 /usr/lib/pa20_64/libpthread_tr.1

	OS-Core.CORE-SHLIBS,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
	4125327792 159744 /usr/lib/libpthread.1
	1192710966 184320 /usr/lib/libpthread_tr.1

	ProgSupport.PAUX-ENG-A-MAN,fr=B.11.11,
		fa=HP-UX_B.11.11_32/64,v=HP:
	3591096921 8533 /usr/share/man/man3.Z/
		pthread_ldom_bind_np.3t
	3591096921 8533 /usr/share/man/man3.Z/pthread_ldom_id_np.3t
	3591096921 8533 /usr/share/man/man3.Z/
		pthread_num_ldomprocs_np.3t
	3591096921 8533 /usr/share/man/man3.Z/
		pthread_num_ldoms_np.3t
	3591096921 8533 /usr/share/man/man3.Z/
		pthread_num_processors_np.3t
	3591096921 8533 /usr/share/man/man3.Z/
		pthread_processor_bind_np.3t
	3591096921 8533 /usr/share/man/man3.Z/
		pthread_processor_id_np.3t
	3591096921 8533 /usr/share/man/man3.Z/
		pthread_pset_bind_np.3t
	3591096921 8533 /usr/share/man/man3.Z/
		pthread_spu_to_ldom_np.3t

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies:
	PHCO_27632:
	To enable the new mutex type which can be unlocked
	by a thread other than the owner, the following
	must be installed.
	PHCO_27632
	PHCO_27633.
	These product updates can be installed in any order.
	If any of these product updates are not insatlled,
	this product update will have no impact on your
	system.

	PHCO_26466:  To enable the process shared mutex performance,
	the following must be installed:  PHKL_26467, PHKL_26468,
	PHKL_26469 and PHCO_26466.  These product updates may be
	installed in any order.  If any of these product updates are
	not installed, this product update will have no impact on
	your system.

	PHCO_25751:  To enable the pthread shared
	mutex performance enhancement, the following must be
	installed:  PHKL_26240, PHKL_26316, and PHCO_25751

	PHCO_25226:  Perf changes enabled by
	pthread_mutex_disable_handoff_np() or
	pthread_mutexattr_disable_handoff_np() or by setting the
	environment variable PTHREAD_DISABLE_HANDOFF=ON.  By default
	these perf changes are disabled.  The first API pthread_
	mutex_disable_handoff_np() is for process wide disabling of
	handoff mode in all mutexes.  So is the env.  variable.  The
	pthread_mutexattr_disable_handoff_np() takes as argument
	pointer to pthread_mutexattr_t and can be used to disable
	handoff mode for a particular mutex.  The pthread_mutex_
	disable_handoff_np() has no arguments and has to be called
	by the main thread before any new threads are created.
	"Handoff mode" is used to strictly adhere to certain
	characteristics of POSIX real-time threads.  If your
	application does not use any real-time threads trying to
	take mutex locks, you can call this new API to get the
	performance benefits.  To enable the TLS feature, the
	following patches should also be installed:  PHCO_23427 libc
	cumulative patch PHSS_23441 linker cumulative patch
	PHSS_23794 linker startup patch PHSS_23953 Fortran90 B.11.01
	patch

Supersedes:
	PHCO_29960 PHCO_29109 PHCO_27632 PHCO_26466 PHCO_25751 PHCO_25226
	PHCO_24584 PHCO_23846

Equivalent Patches: None

Patch Package Size: 590 KBytes

Installation Instructions:
	Please review all instructions and the Hewlett-Packard
	SupportLine User Guide or your Hewlett-Packard support terms
	and conditions for precautions, scope of license,
	restrictions, and, limitation of liability and warranties,
	before installing this patch.
	------------------------------------------------------------
	1. Back up your system before installing a patch.

	2. Login as root.

	3. Copy the patch to the /tmp directory.

	4. Move to the /tmp directory and unshar the patch:

		cd /tmp
		sh PHCO_30544

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHCO_30544.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHCO_30544.  If you do not wish to retain a
	copy of the original software, include the patch_save_files
	option in the swinstall command above:

		-x patch_save_files=false

	WARNING: If patch_save_files is false when a patch is installed,
		 the patch cannot be deinstalled.  Please be careful
		 when using this feature.

	For future reference, the contents of the PHCO_30544.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHCO_30544.depot

	To put this patch on a magnetic tape and install from the
	tape drive, use the command:

		dd if=/tmp/PHCO_30544.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None