Document revision date: 19 July 1999

Chapter 10
10	Optional Features for Improving I/O Performance
10.1	Fast I/O
10.1.1	Fast I/O Benefits
10.1.2	Using Buffer Objects
10.1.3	Differences Between Fast I/O Services and $QIO
10.1.4	Using Fast I/O Services
10.1.4.1	Using Fandles
10.1.4.2	Modifying Existing Applications
10.1.4.3	I/O Status Area (IOSA)
10.1.4.4	$IO_SETUP
10.1.4.5	$IO_PERFORM[W]
10.1.4.6	$IO_CLEANUP
10.1.4.7	Fast I/O FDT Routine (ACP_STD$FASTIO_BLOCK)
10.1.5	Additional Information
10.2	Fast Path
10.2.1	Fast Path Features and Benefits
10.2.2	Using Fast Path
10.2.2.1	Fast Path Sysgen Parameters
10.2.2.2	Identifying and Setting A Port's Preferred CPU
10.2.3	Fast Path Restrictions
Appendix A
Appendix A	I/O Function Codes
A.1	ACP-QIO Interface Driver
A.2	Disk Drivers
A.3	Magnetic Tape Drivers
A.4	Mailbox Driver
A.5	Terminal Driver
A.6	Local Area Network Device Drivers
A.7	Fast I/O Function Codes and Modifiers
A.8	Fast Path Function Codes and Modifiers
Appendix B
Appendix B	IO$_DIAGNOSE Function for SCSI Class Drivers
Appendix C
Appendix C	Tables
C.1	DEC Multinational Character Set
C.2	Terminal Sequences and Modes
Appendix D
Appendix D	Control Connection Routines
Command 1	PTD$CANCEL
Command 2	PTD$CREATE
Command 3	PTD$DELETE
Command 4	PTD$READ
Command 5	PTD$READW
Command 6	PTD$SET_EVENT_NOTIFICATION
Command 7	PTD$WRITE
Index
Index
Examples
2-1	DISK_DRIVER.MAR Disk Driver Programming Example
3-1	Defining the P1 Parameter in a IO$_SKIPRECORD QIO
3-2	Device Characteristic Program Example
3-3	Set Mode and Sense Mode Program Example
3-4	MAGNETIC_TAPE.MAR Device Characteristic Program Example
4-1	Mailbox Driver Program Example 1
4-2	Mailbox Driver Program Example 2
4-3	Mailbox Driver Program Example 3
5-1	LAT.C Terminal Driver Programming Example
5-2	FULL_DUPLEX_TERMINAL.MAR Terminal Driver Programming Example
5-3	READ_VERIFY.MAR Terminal Driver Programming Example
6-1	Sample Pseudocode for Pseudoterminal Driver Program
8-1	Generic SCSI Class Driver Call Example
9-1	Using the 'isacfg' at Console Prompt with the DE203
9-2	Using the 'isacfg' at Console Prompt with the DW110
9-3	LANETH.MAR Local Area Network Programming Example
9-4	LAN802.C Local Area Network Programming Example
Figures
1-1	ACP--QIO Interface
1-2	ACP Device- or Function-Dependent Arguments
1-3	ACP Device/Function Argument Descriptor Format
1-4	FIB Format
1-5	Typical Short FIB
1-6	Attribute Control Block Format
1-7	ACP-QIO Record Attributes Area
1-8	ACP--QIO Attributes Statistics Block
1-9	Quota File Transfer Block
1-10	IOSB Contents---ACP-QIO Functions
2-1	Disk Physical Address
2-2	Dual-Ported Disk Drives
2-3	Audio Control Block (AUCB)
2-4	Output Channel Selection and Volume Settings for CD-ROM Ports as Used by the SET_VOLUME Function
2-5	Starting Physical Address
2-6	Physical Cylinder Number Format
2-7	IOSB Contents
2-8	IOSB Contents for the Sense Mode Function
3-1	IO$_SKIPFILE Argument
3-2	IO$_SKIPRECORD Argument
3-3	Sense Mode P1 Buffer
3-4	Set Mode Characteristics Buffer for IO$_SETMODE
3-5	Set Mode Characteristics Buffer for IO$_SETCHAR
3-6	IOSB Contents
4-1	Multiple Mailbox Channels
4-2	$QIO READ STREAM Operation
4-3	Read Mailbox
4-4	Write Mailbox
4-5	Write Attention AST (Read Unsolicited Data)
4-6	Read Attention AST
4-7	Protection Mask
4-8	IOSB Contents---Read Function
4-9	IOSB Contents---Write Function
4-10	IOSB Contents---Set Protection Function
4-11	IOSB Contents---Get Mailbox Information Function
5-1	Modem Control: Two-Way Simultaneous Operation
5-2	Terminal Mailbox Message Format
5-3	Short and Long Forms of Terminator Mask Quadwords
5-4	Itemlist Read Descriptor
5-5	P4 Carriage Control Specifier
5-6	Write Function Carriage Control (Prefix and Postfix Coding)
5-7	Set Mode and Set Characteristics Buffers
5-8	Relationship of Out-of-Band Function with Control Characters
5-9	Set Mode P1 Block
5-10	Example SETMODE Itemlist
5-11	Sense Mode Characteristics Buffer
5-12	Sense Mode Characteristics Buffer (type-ahead)
5-13	Sense Mode P1 Block
5-14	IOSB Contents---Read Function
5-15	IOSB Contents---Itemlist Read Function
5-16	IOSB Contents---Write Function
5-17	IOSB Contents---Set Mode, Set Characteristics, Sense Mode, and Sense Characteristics Functions
5-18	IOSB Contents---LAT Port Driver Function
6-1	Buffer Layout
8-1	OpenVMS SCSI Class/Port Interface
8-2	Generic SCSI Class Driver Flow
8-3	SCSI_NOAUTO System Parameter
9-1	Emulated LAN Topology
9-2	Typical Ethernet Configuration
9-3	LAN Frame Formats
9-4	CSMA/CD Frame with Ethernet Header
9-5	CSMA/CD Frame with IEEE 802.3 Header
9-6	FDDI Frame Format
9-7	Token Ring Frame Format (Alpha Only)
9-8	LAN Emulation Data Frame Format with IEEE 802.3/Ethernet Header
9-9	802.2 Header
9-10	802.1 Header
9-11	802.1 Header Subfields
9-12	Source Routing Field (Alpha Only)
9-13	Frames with Ethernet Format
9-14	Frames with 802 Format
9-15	Frames with 802E Format
9-16	Class I Service 802.2 Header
9-17	User-Supplied Service 802.2 Header
9-18	DSAP and SSAP Format
9-19	802 Extended Header
9-20	DVI$_DEVDEPEND Returns
9-21	Read Function P5 Buffer
9-22	Write Function P5 Buffer
9-23	P2 Extended Characteristics Buffer
9-24	Format of IO$M_UPDATE_MAP Setmode P2 Buffer (Alpha Only)
9-25	Format of the IO$M_ROUTE P2 Buffer (Alpha Only)
9-26	Sense Mode P1 Characteristics Buffer
9-27	Sense Mode Attribute Buffer
9-28	Format of IO$M_SHOW_MAP P2 Buffer (Alpha Only)
9-29	Format of IO$M_SHOW_ROUTE P2 Buffer (Alpha Only)
9-30	IOSB Contents
B-1	OpenVMS SCSI-2 Diagnose Buffer (S2DGB) 32-Bit Layout
B-2	OpenVMS SCSI-2 Diagnose Buffer (S2DGB) 64-Bit Layout
D-1	Device Characteristics Buffer

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