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| author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 10:09:16 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 10:09:16 -0700 |
| commit | 92d15c2ccbb3e31a3fc71ad28fdb55e1319383c0 (patch) | |
| tree | 8d83c0dc3c6b935d8367e331872f242b742f0a8a /Documentation/block/switching-sched.txt | |
| parent | f20bf6125605acbbc7eb8c9420d7221c91aa83eb (diff) | |
| parent | 644bd2f048972d75eb1979b1fdca257d528ce687 (diff) | |
| download | op-kernel-dev-92d15c2ccbb3e31a3fc71ad28fdb55e1319383c0.zip op-kernel-dev-92d15c2ccbb3e31a3fc71ad28fdb55e1319383c0.tar.gz | |
Merge branch 'for-linus' of git://git.kernel.dk/data/git/linux-2.6-block
* 'for-linus' of git://git.kernel.dk/data/git/linux-2.6-block: (63 commits)
Fix memory leak in dm-crypt
SPARC64: sg chaining support
SPARC: sg chaining support
PPC: sg chaining support
PS3: sg chaining support
IA64: sg chaining support
x86-64: enable sg chaining
x86-64: update pci-gart iommu to sg helpers
x86-64: update nommu to sg helpers
x86-64: update calgary iommu to sg helpers
swiotlb: sg chaining support
i386: enable sg chaining
i386 dma_map_sg: convert to using sg helpers
mmc: need to zero sglist on init
Panic in blk_rq_map_sg() from CCISS driver
remove sglist_len
remove blk_queue_max_phys_segments in libata
revert sg segment size ifdefs
Fixup u14-34f ENABLE_SG_CHAINING
qla1280: enable use_sg_chaining option
...
Diffstat (limited to 'Documentation/block/switching-sched.txt')
| -rw-r--r-- | Documentation/block/switching-sched.txt | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/Documentation/block/switching-sched.txt b/Documentation/block/switching-sched.txt index 5fa130a..634c952 100644 --- a/Documentation/block/switching-sched.txt +++ b/Documentation/block/switching-sched.txt @@ -1,3 +1,18 @@ +To choose IO schedulers at boot time, use the argument 'elevator=deadline'. +'noop', 'as' and 'cfq' (the default) are also available. IO schedulers are +assigned globally at boot time only presently. + +Each io queue has a set of io scheduler tunables associated with it. These +tunables control how the io scheduler works. You can find these entries +in: + +/sys/block/<device>/queue/iosched + +assuming that you have sysfs mounted on /sys. If you don't have sysfs mounted, +you can do so by typing: + +# mount none /sys -t sysfs + As of the Linux 2.6.10 kernel, it is now possible to change the IO scheduler for a given block device on the fly (thus making it possible, for instance, to set the CFQ scheduler for the system default, but @@ -20,3 +35,9 @@ noop anticipatory deadline [cfq] # echo anticipatory > /sys/block/hda/queue/scheduler # cat /sys/block/hda/queue/scheduler noop [anticipatory] deadline cfq + +Each io queue has a set of io scheduler tunables associated with it. These +tunables control how the io scheduler works. You can find these entries +in: + +/sys/block/<device>/queue/iosched |
