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Oracle Solaris 11.1 Tunable Parameters Reference Manual     Oracle Solaris 11.1 Information Library
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Document Information

Preface

1.  Overview of Oracle Solaris System Tuning

2.  Oracle Solaris Kernel Tunable Parameters

Where to Find Tunable Parameter Information

General Kernel and Memory Parameters

physmem

default_stksize

lwp_default_stksize

logevent_max_q_sz

segkpsize

noexec_user_stack

fsflush and Related Parameters

fsflush

tune_t_fsflushr

autoup

dopageflush

doiflush

Process-Sizing Parameters

maxusers

reserved_procs

pidmax

max_nprocs

maxuprc

ngroups_max

Paging-Related Parameters

lotsfree

desfree

minfree

throttlefree

pageout_reserve

pages_pp_maximum

tune_t_minarmem

fastscan

slowscan

min_percent_cpu

handspreadpages

pages_before_pager

maxpgio

Swapping-Related Parameters

swapfs_reserve

swapfs_minfree

Kernel Memory Allocator

kmem_flags

kmem_stackinfo

General Driver Parameters

moddebug

ddi_msix_alloc_limit

Network Driver Parameters

igb Parameters

mr_enable

intr_force

ixgbe Parameters

tx_queue_number

rx_queue_number

intr_throttling

rx_limit_per_intr

tx_ring_size

rx_ring_size

tx_copy_threshold

rx_copy_threshold

General I/O Parameters

maxphys

rlim_fd_max

rlim_fd_cur

General File System Parameters

ncsize

dnlc_dir_enable

dnlc_dir_min_size

dnlc_dir_max_size

dnlc_dircache_percent

TMPFS Parameters

tmpfs:tmpfs_maxkmem

tmpfs:tmpfs_minfree

Pseudo Terminals

pt_cnt

pt_pctofmem

pt_max_pty

STREAMS Parameters

nstrpush

strmsgsz

strctlsz

System V Message Queues

System V Semaphores

System V Shared Memory

segspt_minfree

Scheduling

disp_rechoose_interval

Timers

hires_tick

timer_max

SPARC System Specific Parameters

tsb_alloc_hiwater_factor

default_tsb_size

enable_tsb_rss_sizing

tsb_rss_factor

Locality Group Parameters

lpg_alloc_prefer

lgrp_mem_pset_aware

3.  Oracle Solaris ZFS Tunable Parameters

4.  NFS Tunable Parameters

5.  Internet Protocol Suite Tunable Parameters

6.  System Facility Parameters

A.  Tunable Parameters Change History

B.  Revision History for This Manual

Index

TMPFS Parameters

tmpfs:tmpfs_maxkmem

Description

Defines the maximum amount of kernel memory that TMPFS can use for its data structures (tmpnodes and directory entries).

Data Type

Unsigned long

Default

One page or 4 percent of physical memory, whichever is greater.

Range

Number of bytes in one page (8192 for sun4u or sun4v systems, 4096 for all other systems) to 25 percent of the available kernel memory at the time TMPFS was first used.

Units

Bytes

Dynamic?

Yes

Validation

None

When to Change

Increase if the following message is displayed on the console or written in the messages file:

tmp_memalloc: tmpfs over memory limit

The current amount of memory used by TMPFS for its data structures is held in the tmp_kmemspace field. This field can be examined with a kernel debugger.

Commitment Level

Unstable

tmpfs:tmpfs_minfree

Description

Defines the minimum amount of swap space that TMPFS leaves for the rest of the system.

Data Type

Signed long

Default

512

Range

0 to maximum swap space size

Units

Pages

Dynamic?

Yes

Validation

None

When to Change

To maintain a reasonable amount of swap space on systems with large amounts of TMPFS usage, you can increase this number. The limit has been reached when the console or messages file displays the following message:

fs-name: File system full, swap space limit exceeded
Commitment Level

Unstable