AIX Version 4.3 Differences Guide

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2.12.1.2 Network Memory Buffer Pool Allocation Algorithm The algorithm used by the net_malloc kernel service for allocating buffers of various sizes has been changed. The high-water marks for various buffer sizes have been increased, particularly the 2 KB size used by the Ethernet and token ring device drivers. Requests for memory buffers between 16 KB and 128 KB are now rounded to the nearest power of 2. Allocations in this range were rounded to the nearest page size on prior versions of AIX. This change reduces the number of different sizes of buffers available, which in turn reduces the number of free lists the algorithm is required to manage. The method used by net_malloc to maintain free list information has been changed. On prior versions of AIX, each CPU maintained a free list for each different size of buffer. There is now one central free list for each buffer size between 16 KB and 128 KB in size. Each CPU still maintains a free list for each of the smaller buffer sizes. This change minimizes the amount of memory used by unallocated large buffers, while at the same time still allowing each CPU to maintain a list of smaller buffers for faster allocation. 2.12.1.3 Network Memory Buffer Pool Statistics The kernel maintains usage statistics for the buffers allocated from the network memory buffer pool. The information contains details of the number of buffers of each size, and for each size, information on the number of buffers in use and the number of failed requests. This information can be displayed using the netstat -m command. In addition to maintaining information indexed by buffer size, the kernel also maintains information indexed by the purpose the buffer is being used for. The type indexed information can be expensive to maintain, so AIX Version 4.3.2 has introduced a method to disable it. The new extendednetstats network variable, which is altered using the no command, determines whether the by-type statistical information should be collected by the kernel. The variable has a default value of 1, which means that the kernel will collect the information. In order to improve networking performance, the default AIX installation disables collection of this information by changing the value of extendednetstats to 0. This is performed in the file /etc/rc.net that is run during system start up. If you want to view the by-type statistics, you should comment out the section of /etc/rc.net that changes the value of extendednetstats. The following section is near the end of the file and appears as: ################################################################## # This disables extended netstat statistics for performance # reasons. To have extended netstat statistics enabled on # future reboots, comment out the following three lines. ################################################################## if [ -f /usr/sbin/no ] ; then /usr/sbin/no -o extendednetstats=0 >>/dev/null 2>&1 fi The information collected when extendednetstats is set to a value of 1 is displayed near the end of the output produced by the netstat -m command. An example of the output is shown below. # netstat -m 22 AIX Version 4.3 Differences Guide
61 mbufs in use: 32 mbuf cluster pages in use 143 Kbytes allocated to mbufs 0 requests for mbufs denied 0 calls to protocol drain routines 0 sockets not created because sockthresh was reached Kernel malloc statistics: ******* CPU 0 ******* By size inuse calls failed free hiwat freed 32 201 749 0 55 640 0 64 98 325 0 30 320 0 128 61 257 0 35 160 0 256 135 7324 0 25 384 0 512 110 937 0 2 40 0 1024 35 276 0 5 100 0 2048 0 482 0 6 100 0 4096 34 68 0 2 120 0 16384 1 1 0 18 24 7 32768 1 1 0 0 511 0 By type inuse calls failed memuse memmax mapb mbuf 61 6952 0 15616 21760 0 mcluster 32 1123 0 131072 141312 0 socket 212 1034 0 76480 77536 0 pcb 77 457 0 14144 14400 0 routetbl 19 21 0 3008 3648 0 fragtbl 0 132 0 0 32 0 ifaddr 6 6 0 1472 1472 0 mblk 23 196 0 4992 5504 0 mblkdata 2 125 0 512 2816 0 strhead 11 19 0 3232 3680 0 strqueue 18 38 0 9216 10752 0 strmodsw 22 22 0 1408 1408 0 strosr 0 17 0 0 256 0 strsyncq 26 88 0 2752 3200 0 streams 138 153 0 15520 16096 0 file 1 1 0 128 128 0 kernel table 14 14 0 50016 50016 0 locking 3 3 0 384 384 0 temp 9 15 0 5568 10112 0 mcast opts 0 2 0 0 128 0 mcast addrs 2 2 0 128 128 0 Streams mblk statistic failures: 0 high priority mblk failures 0 medium priority mblk failures 0 low priority mblk failures # When extendednetstats is set to a value of 0, the by-type information is not displayed. 2.12.2 Expanded Kernel Heap AIX version 4.3.2 has added a dedicated memory segment for the kernel heap. The kernel heap is a general memory allocation area and is used to store the dynamic data structures created and used by the kernel, kernel extensions, and device drivers. This enhancement has increased the maximum size of the heap by an additional 256 MB. The kernel heap was previously located in the upper part of segment 0 that was not used for kernel text pages. The maximum size of the heap depended on the size of the kernel image that was running. The original location is now used as an overflow buffer and is only used if the dedicated 256 MB kernel heap segment becomes exhausted. AIX Kernel Enhancements 23
Page 1: AIX Version 4.3 Differences Guide R
Page 4 and 5: Take Note! Before using this inform
Page 6 and 7: 2.12.5 Boot Logical Volume Scaling
Page 8 and 9: Chapter 6. System Management and Ut
Page 10 and 11: 7.1.8 Commands and Applications Ena
Page 12 and 13: 8.2.23.1 Input Method Values . . .
Page 14 and 15: 10.6 National Language Enhancements
Page 16 and 17: xiv AIX Version 4.3 Differences Gui
Page 18 and 19: 51. Documentation Search Service. .
Page 20 and 21: 51. List of Locales for Euro-Specif
Page 22 and 23: The authors of the First Edition ar
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Page 26 and 27: The RS/6000 Enterprise Server Model
Page 28 and 29: • 1 MB of Level 2 (L2) cache. •
Page 30 and 31: The Model 260 is designed for custo
Page 32 and 33: Table 3 is a comparison of various
Page 34 and 35: 1.6 Gigabit Fibre Channel Adapter A
Page 36 and 37: 12 AIX Version 4.3 Differences Guid
Page 38 and 39: work as on previous releases of AIX
Page 40 and 41: For AIX systems using AIX Version 3
Page 42 and 43: destructive overlay can be caught w
Page 44 and 45: The maximum number of file descript
Page 48 and 49: 2.12.3 Larger Pipe Buffer Pool The
Page 50 and 51: The nice value has a much greater i
Page 52 and 53: Table 9. Old Priority Algorithm, sc
Page 54 and 55: where it can be directly manipulate
Page 56 and 57: one trillion terabytes. Other 64-bi
Page 58 and 59: ecently used mappings of segment nu
Page 60 and 61: • Executable data and BSS Followi
Page 62 and 63: Figure 6. Interfacing 64-Bit Proces
Page 64 and 65: that can be larger than 2 32 for la
Page 66 and 67: The addr struct is a library-side s
Page 68 and 69: It is also possible to have a situa
Page 70 and 71: A single remap struct fits into a s
Page 72 and 73: Depending on the execution environm
Page 74 and 75: 3.2.4.2 Parameter Passing Examples
Page 76 and 77: On AIX 4.3, the same algorithm is u
Page 78 and 79: All of the following services are e
Page 80 and 81: UNIX98 interface will add very litt
Page 82 and 83: cases, the user is free to override
Page 84 and 85: These ANSI types are defined throug
Page 86 and 87: The following libraries and APIs ar
Page 88 and 89: symbols exported with svc3264 are a
Page 90 and 91: In general, no command user interfa
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4.3.2 The M:N Model In the M:N mode
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sharing the VPs. When the mutex loc
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4.4 Pthreads Suspend and Resume (4.
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4.6.1 Opening Files for Direct I/O
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performance of network memory buffe
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The send_file call only supports th
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• The volume group's disks must b
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The relationship of factor -t, PP n
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The LVM in AIX 4.3.2 supports both
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MAX LVs: 256 FREE PPs: 81 (324 mega
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extended to 511 logical volumes and
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Note Although the chlvcopy command
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Figure 11. Default SMIT Menu SMIT p
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• NIM Install Manager Figure 13 s
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interface. Web-Based System Manager
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configuration change tasks in which
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Find Close Exit Opens a search dial
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Tree Changes the presentation of ic
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6.2.5.11 Status Line The status lin
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Note: The Web-Based System Manager
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A multiple selection is enabled for
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Figure 23. Example of Container Win
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6.4.3 Registered Applications This
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6.5 Daylight Savings Time Before AI
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keep the data and index files synch
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At the end of the install a volume
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cloned alt_inst_rootvg. The default
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6.8.4 Alternate Disk Installation E
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hdisk0 00006091aef8b687 rootvg hdis
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Support in SMIT was updated to allo
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6.10 System Resource Controller Sub
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6.11 TTY Remote Reboot (4.3.2) AIX
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exhaustively consumed. When a NIM o
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In summary, Table 25 shows the diff
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6.14 Error Message Templates (4.3.2
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6.17 System Backup Usability Enhanc
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Figure 31. Memory Exerciser Options
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146 AIX Version 4.3 Differences Gui
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7.1.2.1 Text Representation of Addr
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Anycast • Site-local - Valid only
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Error messages are identified by ha
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the Encapsulating Security Payload
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loaded as well if the administrator
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Figure 33. Typical Output from the
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7.1.8.3 route route was modified to
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specified by name or by number usin
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Figure 39. New SMIT TCP/IP Configur
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7.1.11 IPv6 and IPSec-Related RFCs
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Benefits are only gained when a cli
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of the routing applications are por
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There are new no options added: •
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7.9.1 Reducing the Number of TCP Pa
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• New macros to allow for simple
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thread will have a chance to handle
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unit of bit rate introduces an IPG
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• Debugging purposes. These trace
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Creating the Local Cache File Syste
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Parameter threshblocks=n maxfiles=n
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The automount command is called at
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7.14.2.5 Indirect Maps An indirect
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Event Error Used by the server to i
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8.2.3.1 Window Management The circu
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8.2.11 X Keyboard Extension Prior t
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y telling it to load a new configur
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8.2.12 X Record Extension The purpo
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down to a single round trip. It is
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ackwards compatibility; however, it
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The following is a list of AIX XIM
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mechanism to permit an IM Server to
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• XGetOMValues() • XDisplayOfOM
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locale.ldx /usr/lib/X11/locale/iso8
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objects, so the default installatio
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the same area just like real-world
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• Snap-back scrolling, a feature
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• Secondary transfer, also referr
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• Since the check mark sign is pa
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8.3.4.14 Scrolled Window and Scroll
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• New XmComboBox XmNpositionMode
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This application uses both the X Wi
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8.5.4 New OpenGL Extensions (4.3.2)
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The browser must be a forms-capable
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Figure 50. Documentation Search Ser
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If you have not run Netscape previo
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Previously, the man command had to
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Single-Byte Character Set Support (
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abandoning its standards-based inte
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• __mblen_std() - For all other c
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Locale method Unicode locales ISO88
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Unicode Locale Chinese (Traditional
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10.5 Euro Symbol Support for AIX (4
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Any UTF-8 based locale installed on
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Encoding UTF-8 multi-byte: Byte S
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Keyword p_sign_posn n_sign_posn Des
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Table 54 summarizes the AIX keyboar
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10.5.4 Input Methods for the Euro S
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A selection menu can be closed by p
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Figure 55. UNIVERSAL Input Method:
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Table 56 summarizes the new iconv c
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Converter Type Fileset UCS-2_IBM-11
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• X11.loc.XX_XX.Dt.rte • X11.lo
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Figure 56. German UTF-8: Add Additi
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SMIT uses the chlang command to set
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os.loc.iso.de_DE bos.loc.iso.en_US
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• Thai Cultural Conventions (Unic
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In Japan, most of operating systems
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X11.base.rte This fileset ships the
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Documentation Search Service does n
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Figure 59. Searching Japanese Docum
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Figure 61. A Japanese Book 10.7.3.2
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Figure 63. Input Chinese Character
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Figure 65. A Chinese Book for Insta
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Client 3 capabilities. In this case
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Figure 67. Stand-Alone LDAP Directo
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provides encryption of data and tra
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Changes to schema definitions previ
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environments may vary significantly
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• AIX Version 4 Getting Started,
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• http://www.lexmark.com • http
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How Customers Can Get ITSO Redbooks
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LDIF LFT LID LP LPI LPP LPR/LPD LDA
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authentication 300 authentication h
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E ed command 141 EDTMPDIR 141 effec
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kernel changes. crash command 17 de
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-command security 166 RDB glue 299
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web based systems management 95 arc
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SG24-2014-01 Printed in the U.S.A.
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AIX Version 4.3 Differences Guide

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