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Oracle Solaris Tunable Parameters Reference Manual
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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

zfs_arc_min

zfs_arc_max

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

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

General Driver Parameters

moddebug

ddi_msix_alloc_limit

General I/O Parameters

maxphys

rlim_fd_max

rlim_fd_cur

General File System Parameters

ncsize

rstchown

dnlc_dir_enable

dnlc_dir_min_size

dnlc_dir_max_size

segmap_percent

UFS Parameters

bufhwm and bufhwm_pct

ndquot

ufs_ninode

ufs_WRITES

ufs_LW and ufs_HW

freebehind

smallfile

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

rechoose_interval

Timers

hires_tick

timer_max

sun4u or sun4v Specific Parameters

consistent_coloring

tsb_alloc_hiwater_factor

default_tsb_size

enable_tsb_rss_sizing

tsb_rss_factor

Locality Group Parameters

lpg_alloc_prefer

lgrp_mem_default_policy

lgrp_mem_pset_aware

Solaris Volume Manager Parameters

md_mirror:md_resync_bufsz

md:mirrored_root_flag

3.  NFS Tunable Parameters

4.  Internet Protocol Suite Tunable Parameters

5.  Network Cache and Accelerator Tunable Parameters

6.  System Facility Parameters

A.  Tunable Parameters Change History

B.  Revision History for This Manual

Index

Scheduling

rechoose_interval

Description

Specifies the number of clock ticks before a process is deemed to have lost all affinity for the last CPU it ran on. After this interval expires, any CPU is considered a candidate for scheduling a thread. This parameter is relevant only for threads in the timesharing class. Real-time threads are scheduled on the first available CPU.

Data Type

Signed integer

Default

3

Range

0 to MAXINT

Dynamic?

Yes

Validation

None

When to Change

When caches are large, or when the system is running a critical process or a set of processes that seem to suffer from excessive cache misses not caused by data access patterns.

Consider using the processor set capabilities available as of the Solaris 2.6 release or processor binding before changing this parameter. For more information, see psrset(1M) or pbind(1M).

Commitment Level

Unstable