08-13-2013
- Yes, thatīs totally normal. Most RAM is being used to cache files so access to slower disks can be hopefully avoided.
- Correct, see 1. It depends on your tuning parameters when and how much memory will be freed. Usually from AIX 5.3 TL... (forgot it), the tuning parameters for VMM are good and usually donīt need adjustment.
- If your system actually does page out to Paging Space or page in from there, it will be very slow. So either by tuning or enough memory, you will try to avoid paging at all cost. Therefore these days, you can use a fix amount of Paging Space, which may be rather small compared to RAM. I would use a fix size of 5 GB.
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LEARN ABOUT CENTOS
tuned-main.conf
tuned-main.conf(5) tuned-main.conf file format description tuned-main.conf(5)
NAME
tuned-main.conf - Tuned global configuration file
SYNOPSIS
/etc/tuned/tuned-main.conf
DESCRIPTION
This man page documents format of the Tuned global configuration file. The tuned-main.conf file uses the ini-file format.
dynamic_tuning=BOOL
This defines whether the dynamic tuning is enabled. It is boolean value. It can be True or 1 if the dynamic tuning is enabled and
False or 0 if disabled. In such case only the static tuning will be used. Please note if it is enabled here, it is still possible to
individually disable it in plugins.
sleep_interval=INT
Tuned daemon is periodically waken after INT seconds and checks for events. By default this is set to 1 second. If you have Python 2
interpreter with applied patch from Red Hat Bugzilla #917709 this controls responsiveness time of Tuned to commands (i.e. if you
request profile switch, it may take up to 1 second until Tuned reacts). Increase this number for higher responsiveness times and
more power savings (due to lower number of wakeups). In case you have unpatched Python 2 interpreter, this settings will have no
visible effect, because the intepreter will poll 20 times per second.
update_interval=INT
Update interval for dynamic tuning (in seconds). Tuned daemon is periodically waken after INT seconds, updates its monitors, calcu-
lates new tuning parameters for enabled plugins and applies the changes. Plugins that have disabled dynamic tuning are not pro-
cessed. By default the INT is set to 10 seconds. Tuned daemon doesn't periodically wake if dynamic tuning is globally disabled (see
dynamic_tuning) or this setting set to 0. This must be multiple of sleep_interval.
EXAMPLE
dynamic_tuning = 1
sleep_interval = 1
update_interval = 10
FILES
/etc/tuned/tuned-main.conf
SEE ALSO
tuned(8)
AUTHOR
Written by Jaroslav karvada <jskarvad@redhat.com>.
REPORTING BUGS
Report bugs to <power-management@lists.fedoraproject.org>.
Jaroslav karvada 15 Oct 2013 tuned-main.conf(5)