Patch Name:  PHKL_9871

Patch Description: s700 9.0[357] Diskless-UX (DUX) performance patch

Creation Date: 97/01/21

Post Date:  97/01/30

Hardware Platforms - OS Releases:
        s700: 9.03 9.05 9.07

Products: N/A

Filesets:
        KERN-BLD

Automatic Reboot?: Yes

Status: General Release

Critical:
        Yes
        PHKL_9871: HANG

Path Name:  /hp-ux_patches/s700/9.X/PHKL_9871

Symptoms:
        PHKL_9871:
        Apparent DUX client hangs with many gcsp processes sleeping
        on the server.  Occurs on LANs that are running close to
        saturation.  The server gcsp stack traces contain the
        sequence
            _sleep+0xe8
            isynclock+0x2c
            ufs_getattr+0x38
            dux_getattr_serve+0x164

Defect Description:
        PHKL_9871:
        At each file open, the server notifies all clients with the
        file already open to perform a sync().  On busy LANs, the
        sync() notification may require many retries due to lost
        packets.  When all the clients are starting at once and are
        running similar loads, the sync() requests for shared
        libraries can pile up.  Fix is to only notify sync() on
        clients where the file is open for write.

SR:
        5003335422

Patch Files:  
        /etc/conf/libdskless.a(dux_sync.o)

what(1) Output:
        /etc/conf/libdskless.a(dux_sync.o):
                dux_sync.c     $Revision: 1.5.61.3 $ $Date: 97/01/21
                         06:11:29 $ PATCH_9.03 (PHKL_9871)

sum(1) Output:
        6890 17 /etc/conf/libdskless.a(dux_sync.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. Copy the patch to your /tmp directory and unshar it:

                cd /tmp
                cp patch_source/PHKL_9871 .
                sh PHKL_9871

        3. Become root and run update:

                /etc/update [-r [kernel_gen_file]] -s \
                        /tmp/PHKL_9871.updt PHKL_9871

        Update moves the original software to
        /system/PHKL_9871/orig.  Keep this file to recover from any
        potential problems.  You should move the .text file to
        /system/PHKL_9871 for future reference.

        To put this patch on a magnetic tape and update from the
        tape drive, use dd:

                dd if=PHKL_9871.updt of=/dev/rmt/0m bs=2048

Special Installation Instructions:  None