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36721468a4
freebsd-skq/share/man/man5
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asomers 36721468a4 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
..
a.out.5 multiple: Remove 3rd clause from BSD license where approved by the 2014-03-14 03:07:51 +00:00
acct.5 multiple: Remove 3rd clause from BSD license where approved by the 2014-03-14 03:07:51 +00:00
ar.5 Fix a bunch of "xref refers to *this* page" igor(1) warnings. 2016-06-09 06:55:00 +00:00
autofs.5 Update the autofs(5) manual to reflect it first appeared in 2014-09-03 17:15:12 +00:00
bluetooth.device.conf.5 use .Mt to mark up email addresses consistently (part6) 2014-06-23 08:27:27 +00:00
bluetooth.hosts.5 use .Mt to mark up email addresses consistently (part6) 2014-06-23 08:27:27 +00:00
bluetooth.protocols.5 use .Mt to mark up email addresses consistently (part6) 2014-06-23 08:27:27 +00:00
boot.config.5 use .Mt to mark up email addresses consistently (part6) 2014-06-23 08:27:27 +00:00
cd9660.5 Add a post-humous manpage for cd9660(5), the ISO-9660 file system 2017-03-23 02:57:08 +00:00
core.5 Fix core corruption caused by race in note_procstat_vmmap 2015-10-06 18:07:00 +00:00
devfs.5 use .Mt to mark up email addresses consistently (part6) 2014-06-23 08:27:27 +00:00
devfs.conf.5 Replace references to /dev/acd0 with /dev/cd0 2015-10-13 17:14:27 +00:00
devfs.rules.5 Last few instances of "sentence not on new line". 2016-06-08 09:36:07 +00:00
device.hints.5 Document the fact that tunables can be set in device.hints. 2015-07-23 17:27:10 +00:00
dir.5 multiple: Remove 3rd clause from BSD license where approved by the 2014-03-14 03:07:51 +00:00
disktab.5 multiple: Remove 3rd clause from BSD license where approved by the 2014-03-14 03:07:51 +00:00
elf.5 Fix a bunch of "xref refers to *this* page" igor(1) warnings. 2016-06-09 06:55:00 +00:00
ethers.5
eui64.5
ext2fs.5 Advertise support for ext3 and ext4. 2016-01-23 12:25:24 +00:00
fbtab.5
fdescfs.5 use .Mt to mark up email addresses consistently (part6) 2014-06-23 08:27:27 +00:00
forward.5
freebsd-update.conf.5 use .Mt to mark up email addresses consistently (part6) 2014-06-23 08:27:27 +00:00
fs.5 ufs/extattr.h: Fix documentation of ea_name termination 2017-01-18 17:55:49 +00:00
fstab.5 Allow to disable BIO_DELETE passthru in fstab for swap-on-geli devices by 2015-08-08 09:57:38 +00:00
group.5 multiple: Remove 3rd clause from BSD license where approved by the 2014-03-14 03:07:51 +00:00
hesiod.conf.5
hosts.5 multiple: Remove 3rd clause from BSD license where approved by the 2014-03-14 03:07:51 +00:00
hosts.equiv.5 multiple: Remove 3rd clause from BSD license where approved by the 2014-03-14 03:07:51 +00:00
hosts.lpd.5 multiple: Remove 3rd clause from BSD license where approved by the 2014-03-14 03:07:51 +00:00
intro.5 multiple: Remove 3rd clause from BSD license where approved by the 2014-03-14 03:07:51 +00:00
libmap.conf.5 use .Mt to mark up email addresses consistently (part6) 2014-06-23 08:27:27 +00:00
link.5
linprocfs.5
linsysfs.5
mailer.conf.5 - language tightening 2016-02-19 01:08:03 +00:00
make.conf.5 Remove the old depend (mkdep) code and make FAST_DEPEND the one true way. 2016-03-30 23:50:23 +00:00
Makefile Add a post-humous manpage for cd9660(5), the ISO-9660 file system 2017-03-23 02:57:08 +00:00
Makefile.depend Add META_MODE support. 2015-06-13 19:20:56 +00:00
moduli.5
motd.5
mqueuefs.5 use .Mt to mark up email addresses consistently (part6) 2014-06-23 08:27:27 +00:00
msdosfs.5 use .Mt to mark up email addresses consistently (part6) 2014-06-23 08:27:27 +00:00
nandfs.5 Last few instances of "sentence not on new line". 2016-06-08 09:36:07 +00:00
networks.5 multiple: Remove 3rd clause from BSD license where approved by the 2014-03-14 03:07:51 +00:00
nsmb.conf.5 Fix path for per-user nsmb.conf file 2016-11-24 10:04:20 +00:00
nsswitch.conf.5 Fix a bunch of "xref refers to *this* page" igor(1) warnings. 2016-06-09 06:55:00 +00:00
nullfs.5 Fix a rendering issue in the nullfs(5) manual page. 2015-02-10 18:49:13 +00:00
passwd.5 Correct the document date for last change. 2014-06-05 01:58:21 +00:00
pbm.5
periodic.conf.5 Consolidate random sleeps in periodic scripts 2017-04-01 04:42:35 +00:00
pf.conf.5 pf: port extended DSCP support from OpenBSD 2016-10-13 20:34:44 +00:00
pf.os.5 Various mdoc fixes. 2014-12-21 12:13:49 +00:00
phones.5 multiple: Remove 3rd clause from BSD license where approved by the 2014-03-14 03:07:51 +00:00
portindex.5 use .Mt to mark up email addresses consistently (part6) 2014-06-23 08:27:27 +00:00
portsnap.conf.5 sha256(8) -> sha256(1) 2016-02-29 17:29:34 +00:00
procfs.5 remove procfs ctl interface 2017-03-05 03:05:24 +00:00
protocols.5 multiple: Remove 3rd clause from BSD license where approved by the 2014-03-14 03:07:51 +00:00
quota.user.5 Last few instances of "sentence not on new line". 2016-06-08 09:36:07 +00:00
rc.conf.5 rc.conf(5): fix a .Xr call for chroot(8) 2017-03-23 01:16:26 +00:00
rctl.conf.5
regdomain.5
remote.5 multiple: Remove 3rd clause from BSD license where approved by the 2014-03-14 03:07:51 +00:00
resolver.5 Mention resolvconf(8) in resolv.conf(5). 2016-03-08 11:04:08 +00:00
services.5 Various mdoc fixes. 2014-12-21 12:13:49 +00:00
shells.5 multiple: Remove 3rd clause from BSD license where approved by the 2014-03-14 03:07:51 +00:00
src.conf.5 Regenerate src.conf(5) (again) 2017-03-23 02:29:59 +00:00
stab.5 Tidy up mdoc formatting for "etc.)" at end of line 2017-03-19 01:24:18 +00:00
style.Makefile.5 Document that we use {} for variable expansion. 2015-10-22 04:50:52 +00:00
sysctl.conf.5
tmpfs.5 tmpfs(5): fix mdoc warnings 2017-03-23 02:33:27 +00:00