2 .TH ELVTUNE 8 "14 March 2000" "Version 1.0"
4 elvtune \- I/O elevator tuner
20 allows to tune the I/O elevator per blockdevice queue basis. The
21 tuning can be safely done at runtime. Tuning the elevator means
22 being able to change disk performance and interactiveness. In the
23 output of elvtune the address of the queue tuned will be shown
24 and it can be considered as a queue ID.
25 For example multiple partitions in the same harddisk will
26 share the same queue and so tuning one partition will be
27 like tuning the whole HD.
31 set the max latency that the I/O scheduler will provide on
35 set the max latency that the I/O scheduler will provide on
39 max coalescing factor allowed on writes when there are reads
48 Actually the only fields tunable are those relative
49 to the IO scheduler. It's not possible to select
50 a one-way or two-way elevator yet.
52 For logical blockdevices like LVM the tuning has to
55 devices. Tuning the queue of the LVM logical device
58 0 on success and 1 on failure.
60 Ioctls for tuning elevator behaviour were added in Linux 2.3.99-pre1.
62 Andrea Arcangeli <andrea@suse.de> SuSE
64 The elvtune command is part of the util-linux-ng package and is available from
65 ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.