AcoSail/kernel_optimize_test
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48f15b93b2
kernel_optimize_test/drivers
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Paul Clements 48f15b93b2 NBD: make nbd default to deadline I/O scheduler 
NBD doesn't work well with CFQ (or AS) schedulers, so let's default to
something else.

The two problems I have experienced with nbd and cfq are:

1) nbd hangs with cfq on RHEL 5 (2.6.18) -- this may well have been
   fixed

   There's a similar debian bug that has been filed as well:

   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=447638

   There have been posts to nbd-general mailing list about problems with
   cfq and nbd also.

2) nbd performs about 10% better (the last time I tested) with deadline
   vs.  cfq (the overhead of cfq doesn't provide much advantage to nbd [not
   being a real disk], and you end up going through the I/O scheduler on
   the nbd server anyway, so it makes sense that deadline is better with
   nbd)

Signed-off-by: Paul Clements <paul.clements@steeleye.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-23 17:12:15 -08:00
..
acorn/char
acpi Merge branches 'release', 'bugzilla-9916', 'bugzilla-9982', 'bugzilla-9989', 'misc', 'suspend', 'thermal', 'thinkpad' and 'tsc' into release 2008-02-21 02:41:58 -05:00
amba
ata PM: Introduce PM_EVENT_HIBERNATE callback state 2008-02-23 10:40:04 -08:00
atm
auxdisplay
base Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2008-02-21 16:33:19 -08:00
block NBD: make nbd default to deadline I/O scheduler 2008-02-23 17:12:15 -08:00
bluetooth hci_ldisc: fix null pointer deref 2008-02-12 17:54:16 -08:00
cdrom Merge branch 'for-2.6.25' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2008-02-07 09:02:26 -08:00
char i915: fix AR register restore. 2008-02-22 16:50:29 -08:00
clocksource
connector
cpufreq cpufreq: fix kobject reference count handling 2008-02-21 15:27:06 -08:00
cpuidle ACPI, cpuidle: Clarify C-state description in sysfs 2008-02-14 00:09:55 -05:00
crypto [HIFN]: Fix invalid config ifdefs for RNG support 2008-02-15 19:15:05 +08:00
dca DCA: convert struct class_device to struct device. 2008-02-08 15:33:33 -08:00
dio
dma async_tx: replace 'int_en' with operation preparation flags 2008-02-06 10:12:18 -07:00
edac drivers/edac/i3000: document type promotion 2008-02-07 08:42:23 -08:00
eisa
firewire
firmware dmi: don't save the same device twice 2008-02-23 17:12:14 -08:00
gpio gpio: handle pca953{4,5,6,7,8} too 2008-02-06 10:41:15 -08:00
hid HID: add USB IDs for MacBook 3rd generation 2008-02-13 17:08:04 +01:00
hwmon hwmon: normal_i2c arrays should be const 2008-02-18 21:58:15 -05:00
i2c [ARM] 4827/1: fix two warnings in drivers/i2c/busses/i2c-pxa.c 2008-02-17 10:42:07 +00:00
ide PM: Introduce PM_EVENT_HIBERNATE callback state 2008-02-23 10:40:04 -08:00
ieee1394
infiniband IB/mthca: Free correct MPT on error exit from mthca_fmr_alloc() 2008-02-19 10:42:50 -08:00
input mn10300: add the MN10300/AM33 architecture to the kernel 2008-02-08 09:22:30 -08:00
isdn isdn: fix section mismatch warning for ISACVer 2008-02-09 23:29:28 -08:00
leds PWM LED driver 2008-02-08 09:22:38 -08:00
lguest lguest: accept guest _PAGE_PWT page table entries 2008-02-09 23:24:09 +01:00
macintosh PM: Introduce PM_EVENT_HIBERNATE callback state 2008-02-23 10:40:04 -08:00
mca
md dm-raid1.c: fix NULL dereferences 2008-02-19 15:52:27 -08:00
media V4L/DVB (7219): zoran: Fix namespace conflicts with Zoran 'GPIO_MAX' enum 2008-02-18 12:18:28 -03:00
memstick drivers/memstick/host/tifm_ms.c breakage 2008-02-13 08:16:35 -08:00
message [SCSI] mptbase: fix use-after-free's 2008-02-22 09:08:13 -06:00
mfd ASIC3 driver 2008-02-07 08:42:23 -08:00
misc Merge branches 'release', 'bugzilla-9916', 'bugzilla-9982', 'bugzilla-9989', 'misc', 'suspend', 'thermal', 'thinkpad' and 'tsc' into release 2008-02-21 02:41:58 -05:00
mmc mmc: extend ricoh_mmc to support Ricoh RL5c476 2008-02-08 09:02:47 +01:00
mtd Introduce path_put() 2008-02-14 21:13:33 -08:00
net Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2008-02-21 16:18:05 -08:00
nubus
of [POWERPC] Create and hook up of_platform_device_shutdown 2008-02-06 16:29:59 +11:00
oprofile d_path: Make get_dcookie() use a struct path argument 2008-02-14 21:17:08 -08:00
parisc
parport parport: section fixup 2008-02-13 16:21:19 -08:00
pci copyright owner and author clean up for intel iommu and related files 2008-02-23 17:12:14 -08:00
pcmcia PCI: drivers/pcmcia/i82092.c: fix up after pci_bus_region changes 2008-02-21 15:34:35 -08:00
pnp Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2008-02-14 21:29:46 -08:00
power Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2008-02-07 09:45:58 -08:00
ps3 [POWERPC] PS3: Update sys-manager button events 2008-02-14 22:11:01 +11:00
rapidio
rtc rtc-cmos: display HPET emulation mode 2008-02-23 17:12:14 -08:00
s390 [S390] qdio: FCP/SCSI write I/O stagnates on LPAR 2008-02-19 15:29:35 +01:00
sbus
scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6 2008-02-23 12:29:16 -08:00
serial atmel_serial: fix interrupt handler return value 2008-02-23 17:12:14 -08:00
sh maple: improve detection of attached peripherals 2008-02-14 14:22:11 +09:00
sn
spi spi: pxa2xx_spi clock polarity fix 2008-02-23 17:12:14 -08:00
ssb
tc
telephony
thermal thermal: use ERR_PTR for returning error 2008-02-15 18:21:30 -05:00
uio UIO: fix Greg's stupid changes 2008-02-21 15:27:07 -08:00
usb PM: Introduce PM_EVENT_HIBERNATE callback state 2008-02-23 10:40:04 -08:00
video PM: Introduce PM_EVENT_HIBERNATE callback state 2008-02-23 10:40:04 -08:00
virtio virtio: add missing #include <linux/delay.h> 2008-02-06 10:41:21 -08:00
w1 DS1WM: decouple host IRQ and INTR active state settings 2008-02-07 08:42:06 -08:00
watchdog [WATCHDOG] HP ProLiant WatchDog driver 2008-02-18 17:06:21 +00:00
xen
zorro
Kconfig memstick: initial commit for Sony MemoryStick support 2008-02-09 11:08:34 -08:00
Makefile memstick: initial commit for Sony MemoryStick support 2008-02-09 11:08:34 -08:00