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Alan Somers 86571b9c01 Consolidate random sleeps in periodic scripts 
Multiple periodic scripts sleep for a random amount of time in order to
mitigate the thundering herd problem. This is bad, because the sum of
multiple uniformly distributed random variables approaches a normal
distribution, so the problem isn't mitigated as effectively as it would be
with a single sleep.

This change creates a single configurable anticongestion sleep. periodic
will only sleep if at least one script requires it, and it will never sleep
more than once per invocation. It also won't sleep if periodic was run
interactively, fixing an unrelated longstanding bug.

PR:		217055
PR:		210188
Reviewed by:	cy
MFC after:	3 weeks
Differential Revision:	https://reviews.freebsd.org/D10211
2017-04-01 04:42:35 +00:00
..
autofs Fix -media to not mount ufs with "async"; it doesn't make sense when 2016-09-20 04:54:00 +00:00
bluetooth
casper Please welcome casperd daemon. It (and its services) will be responsible for 2013-12-02 08:21:28 +00:00
defaults Consolidate random sleeps in periodic scripts 2017-04-01 04:42:35 +00:00
devd Sort REALTEK section and remove duplicate entry for RTL8192CU. 2017-01-24 03:00:22 +00:00
etc.aarch64 Update the arm64 ttys file to enable the correct uart based on which device 2015-10-01 09:36:18 +00:00
etc.amd64 Enable all callin ttys if the tty is an available console. 2015-10-20 16:10:46 +00:00
etc.arm Enable ttyu1, ttyu2, ttyu3 for arm installations. 2015-06-21 19:50:02 +00:00
etc.i386 Enable all callin ttys if the tty is an available console. 2015-10-20 16:10:46 +00:00
etc.mips Enable all callin ttys if the tty is an available console. 2015-10-20 16:10:46 +00:00
etc.powerpc Enable all callin ttys if the tty is an available console. 2015-10-20 16:10:46 +00:00
etc.riscv Start support for the RISC-V 64-bit architecture developed by UC Berkeley. 2015-12-11 22:55:23 +00:00
etc.sparc64 Enable all callin ttys if the tty is an available console. 2015-10-20 16:10:46 +00:00
gss
mail Add a ${CP} alias for copying files in the build. 2015-01-16 21:39:08 +00:00
mtree lib/libkvm: start adding basic tests for kvm(3) 2017-03-28 17:37:49 +00:00
newsyslog.conf.d META MODE: Update dependencies with 'the-lot' and add missing directories. 2015-12-01 05:23:19 +00:00
ntp Revert r298887 (spelling fix) and remove $FreeBSD$ because text changes 2016-08-25 02:40:14 +00:00
pam.d Create a rcmds package. 2016-01-21 17:33:31 +00:00
periodic Consolidate random sleeps in periodic scripts 2017-04-01 04:42:35 +00:00
pkg Give hint on how to disable the default repository. 2014-03-30 15:24:17 +00:00
rc.d Remove SVR4 (System V Release 4) binary compatibility support. 2017-02-28 05:14:42 +00:00
root Step 1 of eliminating the "games" distribution: Move binaries to /usr/bin; 2015-02-12 05:35:00 +00:00
sendmail Move /etc/ to SRCTOP 2017-03-12 18:58:55 +00:00
amd.map
apmd.conf
auto_master Stop appending "noatime" in the autofs -media map, and instead add it 2016-09-20 04:52:01 +00:00
blacklistd.conf Add basic blacklist build support 2016-06-02 19:06:04 +00:00
crontab
csh.cshrc
csh.login
csh.logout
ddb.conf
devd.conf Update devd.conf for ports change 421360 2017-02-27 15:32:56 +00:00
devfs.conf
dhclient.conf
disktab 10 years too late add support for "2.88MB 3.5in Extra High Density" 2012-11-02 00:17:30 +00:00
fbtab
freebsd-update.conf Remove remnants of BIND from /etc, since there is no BIND in base now. 2013-11-05 09:30:06 +00:00
ftpusers Remove most of the ATF tools and the _atf user. 2013-10-12 06:06:53 +00:00
gettytab Add 3wire and std as terminal types/classes. These are similar to 2014-03-09 20:51:14 +00:00
group Fix regression introduced on r293801. 2016-01-27 06:28:56 +00:00
hosts
hosts.allow Allow info to display correctly in for varying tabstop settings 2014-12-24 01:50:44 +00:00
hosts.equiv
hosts.lpd
inetd.conf Add an example inetd(8) entry for the Prometheus sysctl exporter. 2016-12-21 08:32:20 +00:00
libalias.conf
libmap.conf Include /usr/local/etc/libmap.d/ by default. 2013-08-01 05:50:42 +00:00
login.access
login.conf Fix handling of umtxp resource limit in sh(1)/ulimit(1), limits(1), add 2016-03-12 14:54:34 +00:00
mac.conf
Makefile Move /etc/ to SRCTOP 2017-03-12 18:58:55 +00:00
Makefile.depend META MODE: Update dependencies with 'the-lot' and add missing directories. 2015-12-01 05:23:19 +00:00
man.alias
master.passwd Capitalize "LDAP" in the description field of the _ypldap entry. 2016-05-10 12:47:36 +00:00
minfree
motd Add the less-ambiguous freebsd-version command. 2014-11-02 19:25:31 +00:00
netconfig
netstart Remove reference to mroute6d in /etc/netstart. 2016-06-25 12:54:27 +00:00
network.subr network.subr: avoid unnecessary reinitialization 2016-02-29 20:21:54 +00:00
networks
newsyslog.conf Increase the default rotation threshold of log files from 100kb to 1000kb 2016-08-24 23:02:20 +00:00
nls.alias
nscd.conf
nsmb.conf Remove IPX support. 2014-03-14 02:58:48 +00:00
nsswitch.conf Implement an NSS backend for netgroups and add getnetgrent_r(3). 2016-06-09 01:28:44 +00:00
ntp.conf Update ntp.conf to use the ntpd pool feature. 2017-01-02 15:19:22 +00:00
opieaccess
pccard_ether Do not try to recreate wlan(4) interface if it already exists. 2016-12-04 15:58:34 +00:00
pf.os Add DragonFly BSD fingerprints to pf.os 2013-12-03 04:32:02 +00:00
phones
portsnap.conf Now that the portsnap buildbox is generating the raw bits for INDEX-12, 2016-08-14 05:18:38 +00:00
printcap
profile
protocols etc: minor spelling fixes. 2016-05-01 16:43:22 +00:00
rc Use checkyesno instead of rolling my own.. 2016-10-23 18:00:09 +00:00
rc.bsdextended
rc.firewall Slight tidy up of comments before MFC 2015-06-29 07:43:09 +00:00
rc.initdiskless etc: minor spelling fixes. 2016-05-01 16:43:22 +00:00
rc.resume wpa_supplicant should be able to reassociate when resuming, so remove a 2013-07-04 07:32:40 +00:00
rc.sendmail
rc.shutdown Since r275359, there is no need to provide a bogus service name. 2015-10-26 15:16:27 +00:00
rc.subr Fix bug preventing limits(1) from being applied 2016-12-03 19:03:40 +00:00
rc.suspend
regdomain.xml Add a new 900MHz GSM regulatory SKU for the Xagyl Communications XC900M. 2012-12-07 06:34:46 +00:00
remote
rpc
services Add an example inetd(8) entry for the Prometheus sysctl exporter. 2016-12-21 08:32:20 +00:00
shells
snmpd.config Move the mibII module up so uncommenting the bridge module works 2017-01-07 09:03:40 +00:00
sysctl.conf
syslog.conf syslogd(8): add an 'include' keyword 2016-11-01 01:41:24 +00:00
termcap.small