Using Linux:Managing the Kernel






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IP tunneling is used similarly to Virtual Private Networks under Windows, and although the two are incompatible, it should be noted that this feature can be used to join two LANs over the Internet by using Linux. Most users can say N here.
IP: Aliasing is the other half of the network aliasing option, and as mentioned earlier, most people won’t need it.
You should also leave the last set of options untouched, although the option Drop Source Routed Frames is recommended for better network security.
The next section of script allows you to enable support for other networking protocols and other kernel functions:


*
*
*
The IPX protocol (CONFIG_IPX)[M/n/y/?]
Appletalk DDP (CONFIG_ATALK)[N/y/m/?]
Amateur Radio AX.25 Level 2 (CONFIG_AX25)[N/y/?]
Bridging (EXPERIMENTAL)(CONFIG_BRIDGE)[N/y/?]
Kernel/User network link driver (CONFIG_NETLINK)[N/y/?]


These options are only for the technologically savvy. IPX can be used with some programs to provide services to Novell clients. The others are best left off.

The next section of script allows you to configure generic SCSI support for your kernel:


*
* SCSI support
*
SCSI support (CONFIG_SCSI)[M/n/y/?]
*
* SCSI support type (disk, tape, CD-ROM)
*
SCSI disk support (CONFIG_BLK_DEV_SD)[M/n/?]
SCSI tape support (CONFIG_CHR_DEV_ST)[N/m/?]
SCSI CD-ROM support (CONFIG_BLK_DEV_SR)[M/n/?]
SCSI generic support (CONFIG_CHR_DEV_SG)[M/n/?]
*
* Some SCSI devices (e.g. CD jukebox)support multiple LUNs
*
Probe all LUNs on each SCSI device
(CONFIG_SCSI_MULTI_LUN)[N/y/?]
Verbose SCSI error reporting (kernel size
+=12K)(CONFIG_SCSI_CONSTANTS)[N/y/?]


These options cover the common functionality for SCSI drivers and devices under Linux. The choices here depend on the hardware you have, although I recommend that verbose SCSI reporting be left off for performance and kernel size reasons.

If you have answered Y to SCSI support, you are now prompted to specify the actual SCSI card or chip your system has:


*
* SCSI low-level drivers
*
7000FASST SCSI support (CONFIG_SCSI_7000FASST)[M/n/?]
Adaptec AHA152X/2825 support (CONFIG_SCSI_AHA152X)[M/n/?]
Adaptec AHA1542 support (CONFIG_SCSI_AHA1542)[M/n/?]
Adaptec AHA1740 support (CONFIG_SCSI_AHA1740)[M/n/?]
Adaptec AIC7xxx support (CONFIG_SCSI_AIC7XXX)[M/n/?]
Enable tagged command queueing
(CONFIG_AIC7XXX_TAGGED_QUEUEING)[Y/n/?]
Override driver defaults for commands per LUN
(CONFIG_OVERRIDE_CMDS)[N/y/?]
Enable SCB paging (CONFIG_AIC7XXX_PAGE_ENABLE)[Y/n/?]
Collect statistics to report in /proc
(CONFIG_AIC7XXX_PROC_STATS)[N/y/?]
Delay in seconds after SCSI bus reset
(CONFIG_AIC7XXX_RESET_DELAY)[15]
AdvanSys SCSI support (CONFIG_SCSI_ADVANSYS)[M/n/?]
Always IN2000 SCSI support (CONFIG_SCSI_IN2000)[M/n/?]
AM53/79C974 PCI SCSI support (CONFIG_SCSI_AM53C974)[M/n/?]
BusLogic SCSI support (CONFIG_SCSI_BUSLOGIC)[M/n/?]
Omit FlashPoint support
(CONFIG_SCSI_OMIT_FLASHPOINT)[N/y/?]
DTC3180/3280 SCSI support (CONFIG_SCSI_DTC3280)[M/n/?]
EATA-DMA (DPT, NEC, AT&T, SNI, AST, Olivetti,
Alphatronix)support (CONFIG_SCSI_EATA_DMA)[M/n/?]
EATA-PIO (old DPT PM2001, PM2012A)support
(CONFIG_SCSI_EATA_PIO)[M/n/?]
EATA ISA/EISA/PCI (DPT and generic EATA/DMA-compliant
boards)support (CONFIG_SCSI_EATA)[M/n/?]
enable tagged command queueing
(CONFIG_SCSI_EATA_TAGGED_QUEUE)[N/y/?]
enable elevator sorting (CONFIG_SCSI_EATA_LINKED_
COMMANDS)[N/y/?]
maximum number of queued commands
(CONFIG_SCSI_EATA_MAX_TAGS)[16]
Future Domain 16xx SCSI support
(CONFIG_SCSI_FUTURE_DOMAIN)[N/m/?]
Generic NCR5380/53c400 SCSI support
(CONFIG_SCSI_GENERIC_NCR5380)[N/m/?]
NCR53c406a SCSI support (CONFIG_SCSI_NCR53C406A)[N/m/?]
NCR53c7,8xx SCSI support (CONFIG_SCSI_NCR53C7xx)[N/m/?]
NCR53C8XX SCSI support (CONFIG_SCSI_NCR53C8XX)[M/n/?]
detect and read serial NVRAMs
(CONFIG_SCSI_NCR53C8XX_NVRAM_DETECT)[N/y/?]
enable tagged command queueing
(CONFIG_SCSI_NCR53C8XX_TAGGED_QUEUE)[N/y/?]
use normal IO (CONFIG_SCSI_NCR53C8XX_IOMAPPED)[N/y/?]
maximum number of queued commands
(CONFIG_SCSI_NCR53C8XX_MAX_TAGS)[4]
synchronous transfers frequency in MHz
(CONFIG_SCSI_NCR53C8XX_SYNC)[5]
not allow targets to disconnect
(CONFIG_SCSI_NCR53C8XX_NO_DISCONNECT)[N/y/?]
assume boards are SYMBIOS compatible
(CONFIG_SCSI_NCR53C8XX_SYMBIOS_COMPAT)[N/y/?]
IOMEGA Parallel Port ZIP drive SCSI support
(CONFIG_SCSI_PPA)[M/n/?]
PAS16 SCSI support (CONFIG_SCSI_PAS16)[N/m/?]
PAS16 SCSI support (CONFIG_SCSI_PAS16)[N/m/?]
Qlogic FAS SCSI support (CONFIG_SCSI_QLOGIC_FAS)[N/m/?]
Qlogic ISP SCSI support (CONFIG_SCSI_QLOGIC_ISP)[N/m/?]
Seagate ST-02 and Future Domain TMC-8xx SCSI support
(CONFIG_SCSI_SEAGATE)[N/m/?]
Tekram DC-390(T)SCSI support (CONFIG_SCSI_DC390T)[N/m/?]
Trantor T128/T128F/T228 SCSI support
(CONFIG_SCSI_T128)[N/m/?]
UltraStor 14F/34F support (CONFIG_SCSI_U14_34F)[N/m/?]
UltraStor SCSI support (CONFIG_SCSI_ULTRASTOR)[N/m/?]
GDT SCSI Disk Array Controller support
(CONFIG_SCSI_GDTH)[N/m/?]


These options are for specific SCSI devices in your system. Particularly, if you want to support more than one or two SCSI devices, setting them as modules is a good idea. If your boot drive is a SCSI disk, and you decide to use modules, ensure that the Initial ramdisk support is enabled and that you remember to make the initial RAM disk with the SCSI driver(s) for your system.

If you do not want to use a SCSI module for your boot device, however, make sure that you delete the initrd<kernel version>.img file in the /boot directory, or that you have turned off initrd support in the kernel. Otherwise, the kernel’s now built-in device driver will initialize the device, and then the device driver included in the initial ramdisk will try to do the same, and fail. This would not be so bad, except that the failed device driver load in this case will trigger a kernel panic. If you neglect to delete the initrd<kernel version>.img file, you can give to the boot the kernel image from the LILO command line with the noinitrd option.
The online help here is most helpful for drivers that give you additional configuration options. In general, Tagged Command Queuing is an option you should enable for the best performance, but check the other options there to ensure that there is not something else in the driver that can affect this.



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