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Add description of DEVICE_POLLING option.

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Luigi Rizzo 2001-12-14 23:35:33 +00:00
parent c578eeb389
commit c7c781634f
2 changed files with 38 additions and 0 deletions
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19
sys/conf/NOTES
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@ -678,6 +678,25 @@ options ATM_UNI #UNI signalling manager
device hea #Efficient ENI-155p ATM PCI
device hfa #FORE PCA-200E ATM PCI
#
# DEVICE_POLLING adds support for mixed interrupt-polling handling
# of network device drivers, which has significant benefits in terms
# of robustness to overloads and responsivity, as well as permitting
# accurate scheduling of the CPU time between kernel network processing
# and other activities. The drawback is a moderate (up to 1/HZ seconds)
# potential increase in response times.
# It is strongly recommended to use HZ=1000 or 2000 with DEVICE_POLLING
# to achieve smoother behaviour.
# Additionally, you can enable/disable polling at runtime with the
# sysctl variable kern.polling.enable (defaults off), and select
# the CPU fraction reserved to userland with the sysctl variable
# kern.polling.user_frac (default 50, range 0..100).
#
# Only the "dc" "fxp" and "sis" devices support this mode of operation at
# the time of this writing.
options DEVICE_POLLING
#####################################################################
# FILESYSTEM OPTIONS

19
sys/i386/conf/NOTES
View File

@ -678,6 +678,25 @@ options ATM_UNI #UNI signalling manager
device hea #Efficient ENI-155p ATM PCI
device hfa #FORE PCA-200E ATM PCI
#
# DEVICE_POLLING adds support for mixed interrupt-polling handling
# of network device drivers, which has significant benefits in terms
# of robustness to overloads and responsivity, as well as permitting
# accurate scheduling of the CPU time between kernel network processing
# and other activities. The drawback is a moderate (up to 1/HZ seconds)
# potential increase in response times.
# It is strongly recommended to use HZ=1000 or 2000 with DEVICE_POLLING
# to achieve smoother behaviour.
# Additionally, you can enable/disable polling at runtime with the
# sysctl variable kern.polling.enable (defaults off), and select
# the CPU fraction reserved to userland with the sysctl variable
# kern.polling.user_frac (default 50, range 0..100).
#
# Only the "dc" "fxp" and "sis" devices support this mode of operation at
# the time of this writing.
options DEVICE_POLLING
#####################################################################
# FILESYSTEM OPTIONS