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ELVTUNE(8) ELVTUNE(8)
NAME
elvtune - I/O elevator tuner
SYNOPSIS
elvtune [-r r_lat] [-w w_lat] [-b b_max] device...
elvtune -h
elvtune -v
DESCRIPTION
elvtune allows to tune the I/O elevator per blockdevice queue basis.
The tuning can be safely done at runtime. Tuning the elevator means
being able to change disk performance and interactiveness. In the out‐
put of elvtune the address of the queue tuned will be shown and it can
be considered as a queue ID. For example multiple partitions in the
same harddisk will share the same queue and so tuning one partition
will be like tuning the whole HD.
OPTIONS
-r r_lat
set the max latency that the I/O scheduler will provide on each
read.
-w w_lat
set the max latency that the I/O scheduler will provide on each
write.
-b b_max
max coalescing factor allowed on writes when there are reads
pending in the queue.
-h help.
-v version.
NOTE
Actually the only fields tunable are those relative to the IO sched‐
uler. It's not possible to select a one-way or two-way elevator yet.
For logical blockdevices like LVM the tuning has to be done on the
physical devices. Tuning the queue of the LVM logical device is use‐
less.
RETURN VALUE
0 on success and 1 on failure.
HISTORY
Ioctls for tuning elevator behaviour were added in Linux 2.3.99-pre1.
AUTHORS
Andrea Arcangeli <andrea@suse.de> SuSE
AVAILABILITY
The elvtune command is part of the util-linux package and is available
from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
Version 1.0 14 March 2000 ELVTUNE(8)
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