linux/include
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
..
acpi ACPI: processor: remove _PDC object list from struct acpi_processor 2009-12-22 03:35:16 -05:00
asm-generic fix up O_SYNC comments 2009-12-17 11:03:24 -05:00
crypto
drm drm: convert drm_ioctl to unlocked_ioctl 2009-12-18 11:22:31 +10:00
keys
linux block: Added in stricter no merge semantics for block I/O 2010-01-29 09:04:08 +01:00
math-emu
media V4L/DVB (13670): soc-camera: Add mt9t112 camera driver 2009-12-16 09:27:41 -02:00
mtd
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-12-30 12:37:35 -08:00
pcmcia pcmcia: CodingStyle fixes 2009-12-07 22:23:40 +01:00
rdma Merge branches 'amso1100', 'cma', 'cxgb3', 'ehca', 'ipath', 'ipoib', 'iser', 'misc', 'mlx4' and 'nes' into for-next 2009-12-15 23:39:25 -08:00
rxrpc
scsi libsrp: fix compile failure 2009-12-30 12:23:27 -08:00
sound Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-12-09 19:43:33 -08:00
trace Merge branch 'linus' into tracing/urgent 2009-12-14 09:16:49 +01:00
video Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6 2009-12-16 10:29:52 -08:00
xen
Kbuild