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author | Jeroen Ruigrok van der Werven <asmodai@FreeBSD.org> | 2000-03-23 16:22:50 +0000 |
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committer | Jeroen Ruigrok van der Werven <asmodai@FreeBSD.org> | 2000-03-23 16:22:50 +0000 |
commit | 000033d0734cb77e9ddf45870ee6a23ba807338d (patch) | |
tree | bd14162a6eb97d9083a960164780af4aa6bb588d /sys/i386/conf/NOTES | |
parent | 1025a2007fb67813ef7c1a91bb056d000d48b5e7 (diff) | |
download | src-000033d0734cb77e9ddf45870ee6a23ba807338d.tar.gz src-000033d0734cb77e9ddf45870ee6a23ba807338d.zip |
Document options HZ, place it in its own section `CLOCK OPTIONS' and
add the undocumented CLK_* options to that section as well.
Submitted by: Mike Tancsa <mike@sentex.ca> (partially)
Notes
Notes:
svn path=/head/; revision=58489
Diffstat (limited to 'sys/i386/conf/NOTES')
-rw-r--r-- | sys/i386/conf/NOTES | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/sys/i386/conf/NOTES b/sys/i386/conf/NOTES index 13da3218c620..bb4a375ff398 100644 --- a/sys/i386/conf/NOTES +++ b/sys/i386/conf/NOTES @@ -701,6 +701,26 @@ options _KPOSIX_VERSION=199309L ##################################################################### +# CLOCK OPTIONS + +# The granularity of operation is controlled by the kernel option HZ whose +# default value (100) means a granularity of 10ms. For an accurate simulation +# of high data rates it might be necessary to reduce the timer granularity to +# 1ms or less. Consider, however, that some interfaces using programmed I/O +# may require a considerable time to output packets. So, reducing the +# granularity too much might actually cause ticks to be missed thus reducing +# the accuracy of operation. + +options HZ=100 + +# Other clock options + +options CLK_CALIBRATION_LOOP +options CLK_USE_I8254_CALIBRATION +options CLK_USE_TSC_CALIBRATION + + +##################################################################### # SCSI DEVICES # SCSI DEVICE CONFIGURATION @@ -2274,9 +2294,6 @@ options NPX_DEBUG # enable npx debugging (FPU/math emu) options AHC_DUMP_EEPROM options AHC_TMODE_ENABLE options CAM_DEBUG_DELAY -options CLK_CALIBRATION_LOOP -options CLK_USE_I8254_CALIBRATION -options CLK_USE_TSC_CALIBRATION options CLUSTERDEBUG options COMPAT_LINUX options CPU_UPGRADE_HW_CACHE |