Patch Name: PHKL_28670

Patch Description: s700_800 11.22 Memory pressure with JFS3.3

Creation Date: 03/02/24

Post Date: 03/03/05

Hardware Platforms - OS Releases:
	s700: 11.22
	s800: 11.22

Products: N/A

Filesets:
	JFS.VXFS-BASE-KRN,fr=B.11.22,fa=HP-UX_B.11.22_IA,v=HP

Automatic Reboot?: Yes

Status: General Release

Critical:
	Yes
	PHKL_28670: OTHER
		Severe memory pressure that degrades system
		performance.

Category Tags:
	defect_repair general_release critical

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_28670

Symptoms:
	PHKL_28670:
	( SR:8606288025 CR:JAGae51958 )
	Memory utilization is unusually high when using JFS3.3 on
	11.22. This can result in a low memory situation where
	processes are slow to start up or may not start up at all,
	response time is degraded, there may be many deactivated
	processes and the pager daemon (vhand) is one of the top cpu
	consumers, as shown by tools such as top(1) or glance(1M).

Defect Description:
	PHKL_28670:
	( SR:8606288025 CR:JAGae51958 )
	JFS3.3 incorrectly passes zeros for the start and end
	indices in the pageout structure, resulting in incorrect
	settings for the next pageout. This prevents "vhand" from
	properly paging this area of memory and can contribute to
	undue memory utilization and resulting in memory pressure.

	Resolution:
	Modified the JFS3.3 paging routines to pass the correct
	start and end indices in the pageout structure, allowing the
	subsequent pageouts to succeed and memory utilization to
	decrease.

Enhancement:
	No

SR:
	8606288025

Patch Files:
	
	JFS.VXFS-BASE-KRN,fr=B.11.22,fa=HP-UX_B.11.22_IA,v=HP:
	/usr/conf/lib/libvxfs.a(vx_vm.o)

what(1) Output:
	
	JFS.VXFS-BASE-KRN,fr=B.11.22,fa=HP-UX_B.11.22_IA,v=HP:
	/usr/conf/lib/libvxfs.a(vx_vm.o):
		vx_vm.c $Date: 2003/02/13 09:13:13 $Revision: r11.22
			/1 PATCH_11.22 (PHKL_28670)

cksum(1) Output:
	
	JFS.VXFS-BASE-KRN,fr=B.11.22,fa=HP-UX_B.11.22_IA,v=HP:
	3838889134 44544 /usr/conf/lib/libvxfs.a(vx_vm.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches: None

Patch Package Size: 60 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 PHKL_28670

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_28670.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_28670.  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 PHKL_28670.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_28670.depot

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

		dd if=/tmp/PHKL_28670.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None