Managing NFS and KRPC Kernel Configurations in HP-UX 11i v2 (November 2013)

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Tested values
Default: 0 (Hashed reader and writer spinlocks are disabled. exportfs lock is used)
Min: 0
Max: 1 (Hashed reader and writer spinlocks are enabled)
Restrictions on changing
The nfs_exportfs_rwlock tunable is dynamic. System reboot is not required to activate a change made
to this tunable.
Note: If there are no exported filesystems in the system, any
change made to the value of the tunable is effective
immediately. If there are exported filesystems in the system,
a system reboot is required for the change to be activated.
Modifying the value
Enable this tunable to improve NFS server performance. This tunable is not available in the next
release of HP-UX. Starting with the HP-UX 11i v3 release, this behavior is enabled by default and is
not user-configurable.
2.2.3 nfs_srv_read_copy_avoid
Description
When servicing read requests from NFS clients, the server will make separate copies of the read data
in kernel memory multiple times as part of processing each request. HP recently identified one of
these in-memory copies as being unnecessary, and by eliminating this additional copy the
performance of servicing read requests increases. The nfs_srv_read_copy_avoid tunable controls
whether the NFS server will avoid this unnecessary in-memory copy or continue using the standard
read logic.
Tested values
Default: 0 (Tunable is disabled)
Min: 0
Max: 1 (Tunable is enabled)
Note: Before you enable this tunable, you must install the
following patches based on the VxFS version installed on
your system:
VxFS 3.5: PHKL_35240, PHKL_35242, PHKL_35243,
PHKL_35244, PHKL_38287, PHKL_38714, and PHKL_38902
VxFS 4.1: PHKL_38433
VxFS 5.0: PHKL_38186