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Clarify the comments related to DUMMYNET and HZ

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MFC after: 3 days
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luigi 2001-12-14 23:25:58 +00:00
parent 656205c800
commit 2591be5c9f
2 changed files with 24 additions and 14 deletions
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19
sys/conf/NOTES
View File

@ -638,9 +638,13 @@ options ACCEPT_FILTER_HTTP
options TCP_DROP_SYNFIN #drop TCP packets with SYN+FIN options TCP_DROP_SYNFIN #drop TCP packets with SYN+FIN
# DUMMYNET enables the "dummynet" bandwidth limiter. You need # DUMMYNET enables the "dummynet" bandwidth limiter. You need
# IPFIREWALL as well. See the dummynet(4) manpage for more info. # IPFIREWALL as well. See the dummynet(4) and ipfw(8) manpages for more info.
# When you run DUMMYNET it is advisable to also have "options HZ=1000"
# to achieve a smoother scheduling of the traffic.
#
# BRIDGE enables bridging between ethernet cards -- see bridge(4). # BRIDGE enables bridging between ethernet cards -- see bridge(4).
# You can use IPFIREWALL and dummynet together with bridging. # You can use IPFIREWALL and DUMMYNET together with bridging.
#
options DUMMYNET options DUMMYNET
options BRIDGE options BRIDGE
@ -832,11 +836,12 @@ options _KPOSIX_VERSION=199309L
# CLOCK OPTIONS # CLOCK OPTIONS
# The granularity of operation is controlled by the kernel option HZ whose # The granularity of operation is controlled by the kernel option HZ whose
# default value (100) means a granularity of 10ms. For an accurate simulation # default value (100) means a granularity of 10ms (1s/HZ).
# of high data rates it might be necessary to reduce the timer granularity to # Some subsystems, such as DUMMYNET, might benefit from a smaller
# 1ms or less. Consider, however, that some interfaces using programmed I/O # granularity such as 1ms or less, for a smoother scheduling of packets.
# may require a considerable time to output packets. So, reducing the # Consider, however, that reducing the granularity too much might
# granularity too much might actually cause ticks to be missed thus reducing # cause excessive overhead in clock interrupt processing,
# potentially causing ticks to be missed and thus actually reducing
# the accuracy of operation. # the accuracy of operation.
options HZ=100 options HZ=100

19
sys/i386/conf/NOTES
View File

@ -638,9 +638,13 @@ options ACCEPT_FILTER_HTTP
options TCP_DROP_SYNFIN #drop TCP packets with SYN+FIN options TCP_DROP_SYNFIN #drop TCP packets with SYN+FIN
# DUMMYNET enables the "dummynet" bandwidth limiter. You need # DUMMYNET enables the "dummynet" bandwidth limiter. You need
# IPFIREWALL as well. See the dummynet(4) manpage for more info. # IPFIREWALL as well. See the dummynet(4) and ipfw(8) manpages for more info.
# When you run DUMMYNET it is advisable to also have "options HZ=1000"
# to achieve a smoother scheduling of the traffic.
#
# BRIDGE enables bridging between ethernet cards -- see bridge(4). # BRIDGE enables bridging between ethernet cards -- see bridge(4).
# You can use IPFIREWALL and dummynet together with bridging. # You can use IPFIREWALL and DUMMYNET together with bridging.
#
options DUMMYNET options DUMMYNET
options BRIDGE options BRIDGE
@ -832,11 +836,12 @@ options _KPOSIX_VERSION=199309L
# CLOCK OPTIONS # CLOCK OPTIONS
# The granularity of operation is controlled by the kernel option HZ whose # The granularity of operation is controlled by the kernel option HZ whose
# default value (100) means a granularity of 10ms. For an accurate simulation # default value (100) means a granularity of 10ms (1s/HZ).
# of high data rates it might be necessary to reduce the timer granularity to # Some subsystems, such as DUMMYNET, might benefit from a smaller
# 1ms or less. Consider, however, that some interfaces using programmed I/O # granularity such as 1ms or less, for a smoother scheduling of packets.
# may require a considerable time to output packets. So, reducing the # Consider, however, that reducing the granularity too much might
# granularity too much might actually cause ticks to be missed thus reducing # cause excessive overhead in clock interrupt processing,
# potentially causing ticks to be missed and thus actually reducing
# the accuracy of operation. # the accuracy of operation.
options HZ=100 options HZ=100