Solaris Tunable Parameters Reference Manual - SCN Research

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■ ■ ■ ■ ■ ■ ■ ■ Range Units Dynamic? Validation Implicit When to Change Commitment Level Change History Parameter Name Is the exact name that is typed in the /etc/system file, or found in the /etc/default/facility file. Most parameters names are of the form parameter where the parameter name does not contain a colon (:). These names refer to variables in the core portion of the kernel. If the name does contain a colon, the characters to the left of the colon reference the name of a loadable module. The name of the parameter within the module consists of the characters to the right of the colon. For example: module_name:variable Description Data Type Units Default Range Dynamic? Validation Briefly describes what the parameter does or controls. Indicates the signed or unsigned short integer or long integer with the following distinctions: ■ ■ On a system that runs a 32-bit kernel, a long integer is the same size as an integer. On a system that runs a 64-bit kernel, a long integer is twice the width in bits as an integer. For example, an unsigned integer = 32 bits, an unsigned long integer = 64 bits. (Optional) Describes the unit type. What the system uses as the default value. Specifies the possible range allowed by system validation or the bounds of the data type. ■ ■ MAXINT – A shorthand description for the maximum value of a signed integer (2,147,483,647) MAXUINT – A shorthand description for the maximum value of an unsigned integer (4,294,967,295) Yes, if the parameter can be changed on a running system with the mdb or kmdb debugger. No, if the parameter is a boot time initialization only. Checks that the system applies to the value of the variable either as specified in the /etc/system file or the default value, as well as when the validation is applied. 26 Solaris Tunable Parameters Reference Manual • June 2005
Implicit When to Change Commitment Level Change History (Optional) Provides unstated constraints that might exist on the parameter, especially in relation to other parameters. Explains why someone might want to change this value. Includes error messages or return codes. Identifies the stability of the interface. Many of the parameters in this manual are still evolving and are classified as unstable. For more information, see attributes(5). (Optional) Contains a link to the Change History appendix, if applicable. Tuning the Solaris Kernel The following table describes the different ways tunable parameters can be applied. Apply Tunable Parameters in These Ways For More Information Modify the /etc/system file “/etc/system File” on page 27 Use the kernel debugger (kmdb) “kmdb Command” on page 29 Use the modular debugger (mdb) “mdb Command” on page 29 Use the ndd command to set TCP/IP parameters Chapter 4 Modify the /etc/default files “Tuning NCA Parameters” on page 172 /etc/system File The /etc/system file provides a static mechanism for adjusting the values of kernel parameters. Values specified in this file are read at boot time and are applied. Any changes that are made to the file are not applied to the operating system until the system is rebooted. Prior to the Solaris 8 release, /etc/system entries that set the values of parameters were applied in two phases: ■ ■ The first phase obtains various bootstrap parameters (for example, maxusers) to initialize key system parameters. The second phase calculates the base configuration by using the bootstrap parameters, and all values specified in the /etc/system file are applied. In the case of the bootstrap parameters, reapplied values replace the values that are Chapter 1 • Overview of Solaris System Tuning 27
Page 1 and 2: Solaris Tunable Parameters Referenc
Page 3 and 4: Contents Preface 13 1 Overview of S
Page 5 and 6: General Driver Parameter 62 moddebu
Page 7 and 8: nfs:nfs3_nra 109 nfs:nfs4_nra 109 n
Page 9 and 10: tcp_keepalive_interval 153 tcp_keep
Page 11 and 12: A Tunable Parameters Change History
Page 13 and 14: Preface The Solaris Tunable Paramet
Page 15 and 16: ■ Sun Performance and Tuning: SPA
Page 17 and 18: TABLE P-2 Shell Prompts Shell (Cont
Page 19 and 20: CHAPTER 1 Overview of Solaris Syste
Page 21 and 22: Many applications that previously r
Page 23 and 24: IP Forwarding Changes In this Solar
Page 25: Tuning a Solaris System The Solaris
Page 29 and 30: kmdb Command kmdb is a interactive
Page 31 and 32: sysdef Command The sysdef command p
Page 33 and 34: CHAPTER 2 Solaris Kernel Tunable Pa
Page 35 and 36: the startup process, the value of p
Page 37 and 38: When to Change When the system pani
Page 39 and 40: A Solaris system running a 64-bit k
Page 41 and 42: When to Change Commitment Level See
Page 43 and 44: Data Type Default Range Units Dynam
Page 45 and 46: Units Dynamic? Validation Commitmen
Page 47 and 48: Default Range Units Dynamic? max_np
Page 49 and 50: Default Range The greater of 1/64th
Page 51 and 52: minfree Description Data Type Speci
Page 53 and 54: Range The minimum value is 64 Kbyte
Page 55 and 56: Commitment Level Unstable fastscan
Page 57 and 58: Units Dynamic? Validation When to C
Page 59 and 60: Data Type Default Range Unsigned lo
Page 61 and 62: Flag Setting Description AUDIT 0x1
Page 63 and 64: ■ descr = 0x2a Nov 5 16:16:50 sys
Page 65 and 66: lim_fd_max Description Data Type De
Page 67 and 68: Validation When to Change None. Lar
Page 69 and 70: Data Type Default 40 Range Units Dy
Page 71 and 72: Units bufhwm: Kbytes bufhwm_pct: pe
Page 73 and 74: dquot table full Commitment Level U
Page 75 and 76: ufs_WRITES Description Data Type De
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smallfile Description Determines th
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Pseudo Terminals Pseudo terminals,
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Dynamic? Validation When to Change
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Range Units Dynamic? Validation Whe
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Default Range Units Dynamic? Valida
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When to Change Commitment Level Whe
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When to Change Commitment Level Cha
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Solaris Volume Manager Parameters m
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Network Driver Parameters intr_blan
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CHAPTER 3 NFS Tunable Parameters Th
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Units Dynamic? Validation When to C
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Data Type Default Signed integer (3
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Range Units Dynamic? Validation Whe
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nfs:nfs4_dynamic Description Data T
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If you disable the nfs:nfs_disable_
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Data Type Default 8 The operations
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nfs:nfs3_nra Description Data Type
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When to Change Because rnodes are c
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nfs:nfs4_shrinkreaddir Description
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nfs:nfs_disable_rddir_cache Descrip
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nfs:nfs3_max_transfer_size paramete
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Data Type Default 1 Range 0 to 2 31
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Units Dynamic? Validation When to C
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nfs:nfs3_max_transfer_size Descript
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nfs:nfs3_max_transfer_size_clts Des
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nfssrv:rfs_write_async Description
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pcmod Module Parameters This sectio
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Data Type Default Integer (32-bit)
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The size of the cache should match
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CHAPTER 4 Internet Protocol Suite T
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IP Tunable Parameters ip_icmp_err_i
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When to Change Commitment Level Do
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When to Change Consider changing th
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When to Change Do not increase this
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Dynamic? When to Change Commitment
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When to Change Commitment Level Eve
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For more information, refer to RFC
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tcp_conn_req_max_q0 Description Def
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tcp_mdt_max_pbufs Description Defau
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TCP/IP Parameters Set in the /etc/s
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Commitment Level Unstable tcp_rexmi
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Range Dynamic? When to Change Commi
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SCTP Tunable Parameters sctp_max_in
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sctp_heartbeat_interval Description
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Default 102,400 Range 8,192 to 1,07
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Default 60,000 Range 1,000 to 60,00
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sctp_addip_enabled Description Defa
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CHAPTER 5 Network Cache and Acceler
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nca:nca_conn_req_max_q0 Description
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sq_max_size Description Default Ran
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CHAPTER 6 System Facility Parameter
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For details, see ftp(4). inetinit T
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tar For a description of the -f fun
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APPENDIX A Tunable Parameters Chang
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Maximum of the triplet (200, tune_t
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NFS Parameters nfs:nrnode (Solaris
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Commitment Level ■ Keep this feat
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Commitment Level Unstable xxx:ip_fo
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Commitment Level Unstable Parameter
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msgsys:msginfo_msgtql (Solaris 9 Re
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msgsys:msginfo_msgseg (Solaris 9 Re
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Validation When to Change Commitmen
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When to Change Commitment Level Whe
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System V Shared Memory Parameters s
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APPENDIX B Revision History for Thi
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■ ■ msgsys:msginfo_msgseg msgsy
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SCTP Tunable Parameters The followi
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1. This message is displayed if the
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Index A autofs, 178 autoup, 41 E en
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nfs:nfs3_max_transfer_size_cots, 12
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