linux/Documentation
Alan D. Brunelle 488991e28e block: Added in stricter no merge semantics for block I/O
Updated 'nomerges' tunable to accept a value of '2' - indicating that _no_
merges at all are to be attempted (not even the simple one-hit cache).

The following table illustrates the additional benefit - 5 minute runs of
a random I/O load were applied to a dozen devices on a 16-way x86_64 system.

nomerges        Throughput      %System         Improvement (tput / %sys)
--------        ------------    -----------     -------------------------
0               12.45 MB/sec    0.669365609
1               12.50 MB/sec    0.641519199     0.40% / 2.71%
2               12.52 MB/sec    0.639849750     0.56% / 2.96%

Signed-off-by: Alan D. Brunelle <alan.brunelle@hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2010-01-29 09:04:08 +01:00
..
ABI block: Added in stricter no merge semantics for block I/O 2010-01-29 09:04:08 +01:00
accounting
acpi ACPI: support customizing ACPI control methods at runtime 2009-12-11 01:50:08 -05:00
aoe
arm OMAP: DSS2: Documentation for DSS2 2009-12-09 12:04:34 +02:00
auxdisplay
blackfin Blackfin: add an example showing how to use the gptimers API 2009-12-15 00:15:04 -05:00
block block: Added in stricter no merge semantics for block I/O 2010-01-29 09:04:08 +01:00
blockdev
cdrom
cgroups
connector
console
cpu-freq
cpuidle
cris
crypto
development-process
device-mapper dm snapshot: add merge target 2009-12-10 23:52:30 +00:00
DocBook Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6 2009-12-16 10:09:16 -08:00
driver-model Driver core: driver_attribute parameters can often be const* 2009-12-23 11:23:43 -08:00
dvb
early-userspace
fault-injection
fb viafb: documentation update 2009-12-16 07:20:05 -08:00
filesystems ext4: Update documentation to correct the inode_readahead_blks option name 2009-12-24 17:51:42 -05:00
firmware_class
frv
hwmon hwmon: New driver for AMD Family 10h/11h CPUs 2009-12-16 21:38:25 +01:00
i2c i2c: Get rid of struct i2c_client_address_data 2009-12-14 21:17:25 +01:00
i2o
ia64
ide
infiniband IB: Fix typo in ipoib.txt 2009-12-09 14:21:36 -08:00
input
ioctl
isdn gigaset: documentation amendments 2009-12-08 20:30:41 -08:00
ja_JP
kbuild kbuild: generate modules.builtin 2009-12-12 13:08:16 +01:00
kdump
ko_KR
kvm KVM: x86: Extend KVM_SET_VCPU_EVENTS with selective updates 2009-12-27 13:36:33 -02:00
laptops thinkpad-acpi: update volume subdriver documentation 2009-12-26 22:37:58 -05:00
lguest
m68k
make
mips
misc-devices ad525x_dpot: new driver for AD525x digital potentiometers 2009-12-15 08:53:25 -08:00
mn10300
mtd
namespaces
netlabel
networking
parisc
PCI
pcmcia
power PM: Runtime PM documentation update 2009-12-22 20:43:40 +01:00
powerpc Merge commit 'kumar/next' into merge 2009-12-21 09:30:42 +11:00
pps
prctl
RCU
s390
scheduler
scsi Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-12-09 19:43:33 -08:00
serial tty: docs: serial/tty, add to ldisc methods 2009-12-11 15:18:05 -08:00
sh
sound ALSA: Fix a typo in Procfile.txt 2009-12-26 18:37:44 +01:00
sparc
spi
sysctl doc: Add documentation for bootloader_{type,version} 2009-12-11 14:28:56 -08:00
telephony
thermal
timers
trace mm tracing: cleanup Documentation/trace/events-kmem.txt 2009-12-22 14:17:55 -08:00
uml
usb USB: power management documentation update 2009-12-23 11:34:09 -08:00
video4linux V4L/DVB (13651): sh_mobile_ceu_camera: document the scaling and cropping algorithm 2009-12-16 09:27:20 -02:00
vm HWPOISON: Use correct name for MADV_HWPOISON in documentation 2009-12-16 12:20:00 +01:00
w1
watchdog
wimax
x86
zh_CN
00-INDEX
applying-patches.txt
atomic_ops.txt
bad_memory.txt
basic_profiling.txt
binfmt_misc.txt
braille-console.txt
bt8xxgpio.txt
btmrvl.txt
BUG-HUNTING
cachetlb.txt
Changes netfilter: xtables: document minimal required version 2009-12-14 14:52:10 +01:00
CodingStyle
cpu-hotplug.txt cpumask: don't recommend set_cpus_allowed hack in Documentation/cpu-hotplug.txt 2009-12-17 11:43:29 +10:30
cpu-load.txt
cputopology.txt
credentials.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt
devices.txt
DMA-API.txt
DMA-attributes.txt
DMA-ISA-LPC.txt
DMA-mapping.txt use DMA_BIT_MASK instead of inline constant 2009-12-09 18:59:52 -08:00
dmaengine.txt
dontdiff dontdiff: add generated 2009-12-12 13:08:13 +01:00
dynamic-debug-howto.txt
edac.txt
eisa.txt
email-clients.txt
feature-removal-schedule.txt Merge branch 'asus' into release 2009-12-15 22:34:48 -05:00
flexible-arrays.txt
futex-requeue-pi.txt
gcov.txt
gpio.txt gpiolib: add support for changing value polarity in sysfs 2009-12-16 07:20:01 -08:00
highuid.txt
HOWTO
hw_random.txt
initrd.txt
Intel-IOMMU.txt
intel_txt.txt
io-mapping.txt
IO-mapping.txt
io_ordering.txt
iostats.txt
IPMI.txt
IRQ-affinity.txt
IRQ.txt
irqflags-tracing.txt
isapnp.txt
java.txt
kernel-doc-nano-HOWTO.txt
kernel-docs.txt
kernel-parameters.txt ACPI: introduce kernel parameter acpi_sleep=sci_force_enable 2009-12-30 18:32:01 -05:00
keys-request-key.txt
keys.txt
kmemcheck.txt
kmemleak.txt
kobject.txt
kprobes.txt
kref.txt
ldm.txt
leds-class.txt
leds-lp3944.txt
local_ops.txt
lockdep-design.txt
lockstat.txt lockstat: Add usage info to Documentation/lockstat.txt 2009-12-06 13:20:02 +01:00
logo.gif
logo.txt
magic-number.txt
Makefile
ManagementStyle
mca.txt
md.txt md: add 'recovery_start' per-device sysfs attribute 2009-12-14 12:58:57 +11:00
memory-barriers.txt
memory-hotplug.txt mm: add numa node symlink for memory section in sysfs 2009-12-15 08:53:17 -08:00
memory.txt
mono.txt
mutex-design.txt
nmi_watchdog.txt
nommu-mmap.txt nommu: fix malloc performance by adding uninitialized flag 2009-12-15 08:53:24 -08:00
numastat.txt
oops-tracing.txt
parport-lowlevel.txt
parport.txt
pi-futex.txt
pnp.txt
preempt-locking.txt
printk-formats.txt
prio_tree.txt
rbtree.txt
rfkill.txt
robust-futex-ABI.txt
robust-futexes.txt
rt-mutex-design.txt
rt-mutex.txt
rtc.txt
SAK.txt
SecurityBugs
SELinux.txt
serial-console.txt
sgi-ioc4.txt
sgi-visws.txt
slow-work.txt
SM501.txt
Smack.txt
sparse.txt
spinlocks.txt Documentation: rw_lock lessons learned 2009-12-14 09:46:56 -08:00
stable_api_nonsense.txt
stable_kernel_rules.txt Doc/stable rules: add new cherry-pick logic 2009-12-23 11:23:43 -08:00
SubmitChecklist doc: SubmitChecklist, add ioctls, remove OSDL reference 2009-12-16 07:20:06 -08:00
SubmittingDrivers
SubmittingPatches
svga.txt
sysfs-rules.txt
sysrq.txt
tomoyo.txt
unaligned-memory-access.txt
unicode.txt
unshare.txt
VGA-softcursor.txt
vgaarbiter.txt vgaarbiter: fix a typo in the vgaarbiter Documentation 2009-12-16 11:28:58 -08:00
video-output.txt
volatile-considered-harmful.txt
voyager.txt
zorro.txt