Patch Name: PHKL_9273
Patch Description: s700 10.20 poor MP file locking throughput
Creation Date: 96/12/23
Post Date: 96/12/30
Hardware Platforms - OS Releases:
s700: 10.20
Products: N/A
Filesets:
OS-Core.CORE-KRN
Automatic Reboot?: Yes
Status: General Superseded
Critical: No
Path Name: /hp-ux_patches/s700/10.X/PHKL_9273
Symptoms:
PHKL_9273:
On MP systems with several processors, applications which
do file locking frequently can perform poorly. The symptoms
are a high switch rate (switch rate > syscall rate) and
heavy system activity (%sys > 90%).
Defect Description:
PHKL_9273:
The file locking code is protected by a single semaphore
(the filesys sema). As the semaphore becomes heavily
utilized, starvation prevention code activates which
leads to excessive spinning and switching.
SR:
4701341644
Patch Files:
/usr/conf/lib/libhp-ux.a(pm_policy.o)
/usr/conf/lib/libhp-ux.a(pm_swtch.o)
/usr/conf/lib/libhp-ux.a(sem_alpha.o)
what(1) Output:
/usr/conf/lib/libhp-ux.a(pm_policy.o):
pm_policy.c $Date: 96/11/20 16:35:14 $ $Revision:
1.7.98.7 $ PATCH_10.20 (PHKL_9273)
/usr/conf/lib/libhp-ux.a(pm_swtch.o):
pm_swtch.c $Date: 96/11/20 16:34:50 $ $Revision:
1.7.98.14 $ PATCH_10.20 (PHKL_9273)
/usr/conf/lib/libhp-ux.a(sem_alpha.o):
sem_alpha.c $Date: 96/11/20 16:33:04 $ $Revision:
1.11.98.5 $ PATCH_10.20 (PHKL_9273)
cksum(1) Output:
280792863 17068 /usr/conf/lib/libhp-ux.a(pm_policy.o)
1488918395 21332 /usr/conf/lib/libhp-ux.a(pm_swtch.o)
3665684469 9532 /usr/conf/lib/libhp-ux.a(sem_alpha.o)
Patch Conflicts: None
Patch Dependencies: None
Hardware Dependencies: None
Other Dependencies: None
Supersedes: None
Equivalent Patches:
PHKL_9339:
s700: 10.10
Patch Package Size: 100 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_9273
5a. For a standalone system, run swinstall to install the
patch:
swinstall -x autoreboot=true -x match_target=true \
-s /tmp/PHKL_9273.depot
5b. For a homogeneous NFS Diskless cluster run swcluster on the
server to install the patch on the server and the clients:
swcluster -i -b
This will invoke swcluster in the interactive mode and
force all clients to be shut down.
WARNING: All cluster clients must be shut down prior to the
patch installation. Installing the patch while the
clients are booted is unsupported and can lead to
serious problems.
The swcluster command will invoke an swinstall session in which
you must specify:
alternate root path - default is /export/shared_root/OS_700
source depot path - /tmp/PHKL_9273.depot
To complete the installation, select the patch by choosing
"Actions -> Match What Target Has" and then "Actions -> Install"
from the Menubar.
5c. For a heterogeneous NFS Diskless cluster:
- run swinstall on the server as in step 5a to install
the patch on the cluster server.
- run swcluster on the server as in step 5b to install
the patch on the cluster clients.
By default swinstall will archive the original software in
/var/adm/sw/patch/PHKL_9273. If you do not wish to retain a
copy of the original software, you can create an empty file
named /var/adm/sw/patch/PATCH_NOSAVE.
Warning: If this file exists when a patch is installed, the
patch cannot be deinstalled. Please be careful
when using this feature.
It is recommended that you move the PHKL_9273.text file to
/var/adm/sw/patch for future reference.
To put this patch on a magnetic tape and install from the
tape drive, use the command:
dd if=/tmp/PHKL_9273.depot of=/dev/rmt/0m bs=2k
Special Installation Instructions: None