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HZ now defaults to 1000 on many architectures, so update NOTES to reflect

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that.

MFC after:	3 days
PR:		113670
Submitted by:	Ighighi <ighighi at gmail.com>
This commit is contained in:
rwatson 2008-03-09 11:29:59 +00:00
parent aa764bd51d
commit b588c3dd60
1 changed files with 9 additions and 9 deletions
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18
sys/conf/NOTES
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@ -880,8 +880,8 @@ options ACCEPT_FILTER_HTTP
# DUMMYNET enables the "dummynet" bandwidth limiter. You need IPFIREWALL
# as well. See dummynet(4) and ipfw(8) for more info. When you run
# DUMMYNET it is advisable to also have "options HZ=1000" to achieve a
# smoother scheduling of the traffic.
# DUMMYNET it is advisable to also have at least "options HZ=1000" to achieve
# a smooth scheduling of the traffic.
options DUMMYNET
# Zero copy sockets support. This enables "zero copy" for sending and
@ -1110,13 +1110,13 @@ options MAC_TEST
# CLOCK OPTIONS
# The granularity of operation is controlled by the kernel option HZ whose
# default value (100) means a granularity of 10ms (1s/HZ).
# Some subsystems, such as DUMMYNET, might benefit from a smaller
# granularity such as 1ms or less, for a smoother scheduling of packets.
# Consider, however, that reducing the granularity too much might
# cause excessive overhead in clock interrupt processing,
# potentially causing ticks to be missed and thus actually reducing
# the accuracy of operation.
# default value (1000 on most architectures) means a granularity of 1ms
# (1s/HZ). Historically, the default was 100, but finer granularity is
# required for DUMMYNET and other systems on modern hardware. There are
# reasonable arguments that HZ should, in fact, be 100 still; consider,
# that reducing the granularity too much might cause excessive overhead in
# clock interrupt processing, potentially causing ticks to be missed and thus
# actually reducing the accuracy of operation.
options HZ=100