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Updated: July 2017
Oracle
®
Solaris 11.3 Tunable Parameters Reference Manual
Document Information
Using This Documentation
Product Documentation Library
Feedback
Chapter 1 Overview of Oracle Solaris System Tuning
Tuning an Oracle Solaris System
/etc/system.d/files
kmdb Command
mdb Command
Tuning Format of Tunable Parameters Descriptions
Special Oracle Solaris tune and var Structures
Viewing Oracle Solaris System Configuration Information
sysdef Command
kstat Utility
Chapter 2 Oracle Solaris Kernel Tunable Parameters
General Kernel and Memory Parameters
default_stksize
logevent_max_q_sz
lwp_default_stksize
noexec_user_stack
physmem
segkpsize
fsflush and Related Parameters
autoup
doiflush
dopageflush
fsflush
tune_t_fsflushr
Process-Sizing Parameters
max_nprocs
maxuprc
maxusers
ngroups_max
pidmax
reserved_procs
Paging-Related Parameters
desfree
fastscan
handspreadpages
lotsfree
maxpgio
min_percent_cpu
minfree
pageout_reserve
pages_before_pager
pages_pp_maximum
slowscan
throttlefree
tune_t_minarmem
Kernel Memory Allocator
kmem_flags
kmem_stackinfo
General Driver Parameters
SPARC: dax_stats_flags
ddi_msix_alloc_limit
moddebug
Network Driver Parameters
IP Protocol Parameters in the Kernel
ip_squeue_worker_wait
ip_squeue_fanout
ipcl_conn_hash_size
igb Parameters
intr_force
mr_enable
ixgbe Parameters
intr_throttling
rx_copy_threshold
rx_limit_per_intr
rx_queue_number
rx_ring_size
tx_copy_threshold
tx_queue_number
tx_ring_size
General I/O Parameters
maxphys
rlim_fd_cur
rlim_fd_max
General File System Parameters
dnlc_dir_enable
dnlc_dir_max_size
dnlc_dir_min_size
dnlc_dircache_percent
ncsize
TMPFS Parameters
tmpfs:tmpfs_maxkmem
tmpfs:tmpfs_minfree
Pseudo Terminals
pt_cnt
pt_max_pty
pt_pctofmem
STREAMS Parameters
nstrpush
strmsgsz
strctlsz
System V Message Queues
System V Semaphores
Timers
hires_tick
timer_max
SPARC: Platform Specific Parameters
default_tsb_size
enable_tsb_rss_sizing
tsb_alloc_hiwater_factor
tsb_rss_factor
Locality Group Parameters
lgrp_mem_pset_aware
lpg_alloc_prefer
Chapter 3 Oracle Solaris ZFS Tunable Parameters
Tuning ZFS Considerations
ZFS Memory Management Parameters
user_reserve_hint_pct
zfs_arc_min
zfs_arc_max
ZFS File-Level Prefetch
zfs_prefetch_disable
ZFS Device I/O Queue Depth
zfs_vdev_max_pending
Tuning ZFS When Using Flash Storage
Adding Flash Devices as ZFS Log or Cache Devices
Ensuring Proper Cache Flush Behavior for Flash and NVRAM Storage Devices
Tuning ZFS for Database Products
Using ZFS with MySQL Considerations
Chapter 4 NFS Tunable Parameters
Tuning the NFS Environment
NFS Module Parameters
nfs:nfs_allow_preepoch_time
nfs:nfs_async_clusters
nfs:nfs3_async_clusters
nfs:nfs4_async_clusters
nfs:nfs_async_timeout
nfs:nfs3_bsize
nfs:nfs4_bsize
nfs:nfs_cots_timeo
nfs:nfs3_cots_timeo
nfs:nfs4_cots_timeo
nfs:nfs_disable_rddir_cache
nfs:nfs_do_symlink_cache
nfs:nfs3_do_symlink_cache
nfs:nfs4_do_symlink_cache
nfs:nfs_dynamic
nfs:nfs3_dynamic
nfs:nfs3_jukebox_delay
nfs:nfs_lookup_neg_cache
nfs:nfs3_lookup_neg_cache
nfs:nfs4_lookup_neg_cache
nfs:nfs_max_threads
nfs:nfs3_max_threads
nfs:nfs4_max_threads
nfs:nfs3_max_transfer_size
nfs:nfs4_max_transfer_size
nfs:nfs3_max_transfer_size_clts
nfs:nfs3_max_transfer_size_cots
nfs:nacache
nfs:nfs_nra
nfs:nfs3_nra
nfs:nfs4_nra
nfs:nrnode
nfs:nfs3_pathconf_disable_cache
nfs:nfs_shrinkreaddir
nfs:nfs3_shrinkreaddir
nfs:nfs_write_error_interval
nfs:nfs_write_error_to_cons_only
NFS-Related SMF Configuration Parameters
server_authz_cache_refresh
netgroup_refresh
nfssrv Module Parameters
nfssrv:nfs_portmon
nfssrv:rfs_write_async
rpcmod Module Parameters
rpcmod:clnt_max_conns
rpcmod:clnt_idle_timeout
rpcmod:svc_idle_timeout
rpcmod:maxdupreqs
rpcmod:cotsmaxdupreqs
Chapter 5 Internet Protocol Suite Tunable Parameters
Overview of Tuning IP Suite Parameters
IP Suite Parameter Validation
Internet Request for Comments
IP Tunable Parameters
_addrs_per_if
_forwarding_src_routed (IPv4 or IPv6)
_icmp_err_interval and _icmp_err_burst
_policy_mask
_respond_to_echo_broadcast (IP) and _respond_to_echo_multicast (IPv4 or IPv6)
hoplimit (IPv6)
hostmodel (IPv4 or IPv6)
send_redirects (IPv4 or IPv6)
ttl (IPv4)
IP Tunable Parameters Related to Duplicate Address Detection
_arp_defend_interval/_ndp_defend_interval
_arp_defend_period/_ndp_defend_period
_arp_defend_rate/_ndp_defend_rate
_arp_fastprobe_count
_arp_fastprobe_interval
_arp_probe_count
_arp_probe_interval
_defend_interval
_dup_recovery
_max_defend
_max_temp_defend
arp_publish_count/ndp_unsolicit_count
arp_publish_interval/ndp_unsolicit_interval
IP Tunable Parameters With Additional Cautions
_icmp_return_data_bytes (IPv4 or IPv6)
_pathmtu_interval
TCP Tunable Parameters
_conn_req_max_q
_conn_req_max_q0
_conn_req_min
_cwnd_max
_deferred_ack_interval
_deferred_acks_max
_ipv4_ttl
_ipv6_hoplimit
_local_dack_interval
_local_dacks_max
_local_slow_start_initial
_rev_src_routes
_rst_sent_rate
_rst_sent_rate_enabled
_slow_start_after_idle
_slow_start_initial
_time_wait_interval
_tstamp_always
_wscale_always
cong_default
cong_enabled
ecn
largest_anon_port
max_buf
recv_buf
sack
send_buf
smallest_anon_port
tcp_cwnd_normal
TCP Parameters With Additional Cautions
_ip_abort_interval
_keepalive_interval
_recv_hiwat_minmss
_rexmit_interval_extra
_rexmit_interval_initial
_rexmit_interval_max
_rexmit_interval_min
_tstamp_if_wscale
UDP Tunable Parameters
_ipv4_ttl
_ipv6_hoplimit
largest_anon_port
max_buf
recv_buf
send_buf
smallest_anon_port
SCTP Tunable Parameters
_addip_enabled
_cookie_life
_cwnd_max
_deferred_ack_interval
_heartbeat_interval
_ignore_path_mtu
_initial_mtu
_initial_out_streams
_initial_ssthresh
_ipv4_ttl
_ipv6_hoplimit
_maxburst
_max_in_streams
_max_init_retr
_new_secret_interval
_pa_max_retr
_pp_max_retr
_prsctp_enabled
_rto_initial
_rto_max
_rto_min
_shutack_wait_bound
_xmit_lowat
cong_default
cong_enabled
largest_anon_port
max_buf
recv_buf
send_buf
smallest_anon_port
ICMP Tunable Parameters
_ipv4_ttl
_ipv6_hoplimit
Per-Route Metrics
Chapter 6 System Facility Parameters
System Default Parameters
autofs
cron
devfsadm
dhcpagent
fs
ftp
inetinit
init
ipsec
kbd
keyserv
login
mpathd
nfs
nfslogd
nss
passwd
su
syslog
tar
telnetd
utmpd
Appendix A System Check Script
Confirming Flush Behavior on the System
Index
Index A
Index C
Index D
Index E
Index F
Index H
Index I
Index K
Index L
Index M
Index N
Index P
Index R
Index S
Index T
Index U
Index W
Index X
Index Z
Language:
English
Index
A
_addip_enabled
_addip_enabled
_addrs_per_if
_addrs_per_if
_arp_defend_interval
_arp_defend_interval/_ndp_defend_interval
_arp_defend_period
_arp_defend_period/_ndp_defend_period
_arp_defend_rate
_arp_defend_rate/_ndp_defend_rate
_arp_fastprobe_count
_arp_fastprobe_count
_arp_fastprobe_interval
_arp_fastprobe_interval
_arp_probe_count
_arp_probe_count
_arp_probe_interval
_arp_probe_interval
arp_publish_count
arp_publish_count/ndp_unsolicit_count
arp_publish_interval
arp_publish_interval/ndp_unsolicit_interval
autofs
autofs
autoup
autoup
C
_conn_req_max_q0
_conn_req_max_q0
_conn_req_max_q
_conn_req_max_q
_conn_req_min
_conn_req_min
_cookie_life
_cookie_life
_cwnd_max
(SCTP)
_cwnd_max
_cwnd_max
(TCP)
_cwnd_max
cong_default (STCP)
cong_default
cong_default (TCP)
cong_default
cong_enabled (SCTP)
cong_enabled
cong_enabled (TCP)
cong_enabled
cron
cron
D
_defend_interval
_defend_interval
_deferred_ack_interval
_deferred_ack_interval
_deferred_ack_interval
_deferred_acks_max
_deferred_acks_max
_dup_recovery
_dup_recovery
dax_stats_flags
dax_stats_flags
ddi_msix_alloc_limit parameter
ddi_msix_alloc_limit
default_stksize
default_stksize
default_tsb_size
default_tsb_size
desfree
desfree
dhcpagent
dhcpagent
dnlc_dir_enable
dnlc_dir_enable
dnlc_dir_max_size
dnlc_dir_max_size
dnlc_dir_min_size
dnlc_dir_min_size
dnlc_dircache_percent
dnlc_dircache_percent
doiflush
doiflush
dopageflush
dopageflush
E
ecn
ecn
enable_tsb_rss_sizing
enable_tsb_rss_sizing
F
_forwarding_src_routed
_forwarding_src_routed (IPv4 or IPv6)
fastscan
fastscan
fs
fs
fsflush
fsflush
ftp
ftp
H
_heartbeat_interval
_heartbeat_interval
handspreadpages
handspreadpages
hires_tick
hires_tick
hoplimit
(IPv6)
hoplimit (IPv6)
hostmodel
hostmodel (IPv4 or IPv6)
I
_icmp_err_burst
_icmp_err_interval and _icmp_err_burst
_icmp_err_interval
_icmp_err_interval and _icmp_err_burst
_icmp_return_data_bytes
_icmp_return_data_bytes (IPv4 or IPv6)
_ignore_path_mtu
_ignore_path_mtu
_initial_mtu
_initial_mtu
_initial_out_streams
_initial_out_streams
_initial_ssthresh
_initial_ssthresh
_ip_abort_interval
_ip_abort_interval
_ipv4_ttl
(ICMP)
_ipv4_ttl
_ipv4_ttl
(SCTP)
_ipv4_ttl
_ipv4_ttl
(TCP)
_ipv4_ttl
_ipv4_ttl
(UDP)
_ipv4_ttl
_ipv6_hoplimit
(ICMP)
_ipv6_hoplimit
_ipv6_hoplimit
(SCTP)
_ipv6_hoplimit
_ipv6_hoplimit
(TCP)
_ipv6_hoplimit
_ipv6_hoplimit
(UDP)
_ipv6_hoplimit
inetinit
inetinit
init
init
intr_force
intr_force
intr_throttling
intr_throttling
ip_squeue_fanout
ip_squeue_fanout
ip_squeue_worker_wait
ip_squeue_worker_wait
ipcl_conn_hash_size
ipcl_conn_hash_size
ipsec
ipsec
K
_keepalive_interval
_keepalive_interval
kbd
kbd
keyserv
keyserv
kmem_flags
kmem_flags
kmem_stackinfo
kmem_stackinfo
L
_local_dack_interval
_local_dack_interval
_local_dacks_max
_local_dacks_max
_local_slow_start_initial
_local_slow_start_initial
largest_anon_port
(SCTP)
largest_anon_port
largest_anon_port
(TCP)
largest_anon_port
largest_anon_port
(UDP)
largest_anon_port
lgrp_mem_pset_aware
lgrp_mem_pset_aware
logevent_max_q_sz
logevent_max_q_sz
login
login
lotsfree
lotsfree
lpg_alloc_prefer
lpg_alloc_prefer
lwp_default_stksize
lwp_default_stksize
M
_max_defend
_max_defend
_max_in_streams
_max_in_streams
_max_init_retr
_max_init_retr
_max_temp_defend
_max_temp_defend
_maxburst
_maxburst
max_buf
(SCTP)
max_buf
max_buf
(TCP)
max_buf
max_buf
(UDP)
max_buf
max_nprocs
max_nprocs
maxpgio
maxpgio
maxphys
maxphys
maxpid
pidmax
maxuprc
maxuprc
maxusers
maxusers
min_percent_cpu
min_percent_cpu
minfree
minfree
moddebug
moddebug
mpathd
mpathd
mr_enable
mr_enable
N
_ndp_defend_interval
_arp_defend_interval/_ndp_defend_interval
_ndp_defend_period
_arp_defend_period/_ndp_defend_period
_ndp_defend_rate
_arp_defend_rate/_ndp_defend_rate
_new_secret_interval
_new_secret_interval
ncsize
ncsize
ndp_unsolicit_count
arp_publish_count/ndp_unsolicit_count
ndp_unsolicit_interval
arp_publish_interval/ndp_unsolicit_interval
nfs:nacache
nfs:nacache
nfs:nfs3_async_clusters
nfs:nfs3_async_clusters
nfs:nfs3_bsize
nfs:nfs3_bsize
nfs:nfs3_cots_timeo
nfs:nfs3_cots_timeo
nfs:nfs3_do_symlink_cache
nfs:nfs3_do_symlink_cache
nfs:nfs3_dynamic
nfs:nfs3_dynamic
nfs:nfs3_jukebox_delay
nfs:nfs3_jukebox_delay
nfs:nfs3_lookup_neg_cache
nfs:nfs3_lookup_neg_cache
nfs:nfs3_max_threads
nfs:nfs3_max_threads
nfs:nfs3_max_transfer_size
nfs:nfs3_max_transfer_size
nfs:nfs3_max_transfer_size_clts
nfs:nfs3_max_transfer_size_clts
nfs:nfs3_max_transfer_size_cots
nfs:nfs3_max_transfer_size_cots
nfs:nfs3_nra
nfs:nfs3_nra
nfs:nfs3_pathconf_disable_cache
nfs:nfs3_pathconf_disable_cache
nfs:nfs3_shrinkreaddir
nfs:nfs3_shrinkreaddir
nfs:nfs4_async_clusters
nfs:nfs4_async_clusters
nfs:nfs4_bsize
nfs:nfs4_bsize
nfs:nfs4_cots_timeo
nfs:nfs4_cots_timeo
nfs:nfs4_do_symlink_cache
nfs:nfs4_do_symlink_cache
nfs:nfs4_lookup_neg_cache
nfs:nfs4_lookup_neg_cache
nfs:nfs4_max_threads
nfs:nfs4_max_threads
nfs:nfs4_max_transfer_size
nfs:nfs4_max_transfer_size
nfs:nfs4_nra
nfs:nfs4_nra
nfs:nfs_allow_preepoch_time
nfs:nfs_allow_preepoch_time
nfs:nfs_async_clusters
nfs:nfs_async_clusters
nfs:nfs_async_timeout
nfs:nfs_async_timeout
nfs:nfs_cots_timeo
nfs:nfs_cots_timeo
nfs:nfs_disable_rddir_cache
nfs:nfs_disable_rddir_cache
nfs:nfs_do_symlink_cache
nfs:nfs_do_symlink_cache
nfs:nfs_dynamic
nfs:nfs_dynamic
nfs:nfs_lookup_neg_cache
nfs:nfs_lookup_neg_cache
nfs:nfs_nra
nfs:nfs_nra
nfs:nfs_shrinkreaddir
nfs:nfs_shrinkreaddir
nfs:nfs_write_error_interval
nfs:nfs_write_error_interval
nfs:nfs_write_error_to_cons_only
nfs:nfs_write_error_to_cons_only
nfs:nrnode
nfs:nrnode
nfs_max_threads
nfs:nfs_max_threads
nfslogd
nfslogd
nfssrv:nfs_portmon
nfssrv:nfs_portmon
nfssrv:rfs_write_async
nfssrv:rfs_write_async
ngroups_max
ngroups_max
noexec_user_stack
noexec_user_stack
nss
nss
nstrpush
nstrpush
P
_pa_max_retr
_pa_max_retr
_pathmtu_interval
_pathmtu_interval
_policy_mask
_policy_mask
_pp_max_retr
_pp_max_retr
_prsctp_enabled
_prsctp_enabled
pageout_reserve
pageout_reserve
pages_before_pager
pages_before_pager
pages_pp_maximum
pages_pp_maximum
passwd
passwd
physmem
physmem
pidmax
pidmax
primarycache
ZFS file system property
Tuning ZFS for Database Products
pt_cnt
pt_cnt
pt_max_pty
pt_max_pty
pt_pctofmem
pt_pctofmem
R
_recv_hiwat_minmss
_recv_hiwat_minmss
_respond_to_echo_broadcast
_respond_to_echo_broadcast (IP) and _respond_to_echo_multicast (IPv4 or IPv6)
_respond_to_echo_multicast
_respond_to_echo_broadcast (IP) and _respond_to_echo_multicast (IPv4 or IPv6)
_rev_src_routes
_rev_src_routes
_rexmit_interval_extra
_rexmit_interval_extra
_rexmit_interval_initial
_rexmit_interval_initial
_rexmit_interval_max
_rexmit_interval_max
_rexmit_interval_min
_rexmit_interval_min
_rst_sent_rate
_rst_sent_rate
_rst_sent_rate_enabled
_rst_sent_rate_enabled
_rto_initial
_rto_initial
_rto_max
_rto_max
_rto_min
_rto_min
recordsize
ZFS file system property
Tuning ZFS for Database Products
recv_buf
(SCTP)
recv_buf
recv_buf
(TCP)
recv_buf
recv_buf
(UDP)
recv_buf
reserved_procs
reserved_procs
rlim_fd_cur
rlim_fd_cur
rlim_fd_max
rlim_fd_max
rpcmod:clnt_idle_timeout
rpcmod:clnt_idle_timeout
rpcmod:clnt_max_conns
rpcmod:clnt_max_conns
rpcmod:cotsmaxdupreqs
rpcmod:cotsmaxdupreqs
rpcmod:maxdupreqs
rpcmod:maxdupreqs
rpcmod:svc_idle_timeout
rpcmod:svc_idle_timeout
rx_copy_threshold
rx_copy_threshold
rx_limit_per_intr
rx_limit_per_intr
rx_queue_number
rx_queue_number
rx_ring_size
rx_ring_size
S
su
su
syslog
syslog
_shutack_wait_bound
_shutack_wait_bound
_slow_start_after_idle
_slow_start_after_idle
_slow_start_initial
_slow_start_initial
sack
sack
secondarycache
ZFS file system property
Tuning ZFS for Database Products
send_buf
(SCTP)
send_buf
send_buf
(TCP)
send_buf
send_buf
(UDP)
send_buf
send_redirects
send_redirects (IPv4 or IPv6)
slowscan
slowscan
smallest_anon_port
(SCTP)
smallest_anon_port
smallest_anon_port
(TCP)
smallest_anon_port
smallest_anon_port
(UDP)
smallest_anon_port
strmsgsz
strctlsz
strmsgsz
T
_time_wait_interval
_time_wait_interval
_tstamp_always
_tstamp_always
_tstamp_if_wscale
_tstamp_if_wscale
tar
tar
tcp_cwnd_normal
tcp_cwnd_normal
throttlefree
throttlefree
timer_max
timer_max
tmpfs_maxkmem
tmpfs:tmpfs_maxkmem
tmpfs_minfree
tmpfs:tmpfs_minfree
tsb_alloc_hiwater
tsb_alloc_hiwater_factor
tsb_rss_factor
tsb_rss_factor
ttl
(IPv4)
ttl (IPv4)
tune_t_fsflushr
tune_t_fsflushr
tune_t_minarmem
tune_t_minarmem
tx_copy_threshold
tx_copy_threshold
tx_queue_number
tx_queue_number
tx_ring_size
tx_ring_size
U
utmpd
utmpd
W
_wscale_always
_wscale_always
X
_xmit_lowat
_xmit_lowat
Z
ZFS file system property
primarycache
Tuning ZFS for Database Products
recordsize
Tuning ZFS for Database Products
secondarycache
Tuning ZFS for Database Products
zfs_arc_max
zfs_arc_max
zfs_arc_min
zfs_arc_min
zfs_prefetch_disable
zfs_prefetch_disable
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