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22dfdf5212
android_kernel_xiaomi_sm8350/drivers
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NeilBrown 22dfdf5212 [PATCH] md: improve read speed to raid10 arrays using 'far copies' 
raid10 has two different layouts.  One uses near-copies (so multiple
copies of a block are at the same or similar offsets of different
devices) and the other uses far-copies (so multiple copies of a block
are stored a greatly different offsets on different devices).  The point
of far-copies is that it allows the first section (normally first half)
to be layed out in normal raid0 style, and thus provide raid0 sequential
read performance.

Unfortunately, the read balancing in raid10 makes some poor decisions
for far-copies arrays and you don't get the desired performance.  So
turn off that bad bit of read_balance for far-copies arrays.

With this patch, read speed of an 'f2' array is comparable with a raid0
with the same number of devices, though write speed is ofcourse still
very slow.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-28 14:42:25 -08:00
..
acorn [ARM] Turn ARM RiscPC PCF8583 i2c RTC driver into a proper module 2005-10-30 19:07:59 +00:00
acpi Fix ACPI processor power block initialization 2005-11-18 07:29:51 -08:00
atm [ATM]: [horizon] fix sparse warnings 2005-11-10 12:55:52 -08:00
base [PATCH] Small fixes to driver core 2005-11-23 23:03:06 -08:00
block [PATCH] revert floppy-fix-read-only-handling 2005-11-23 16:08:38 -08:00
bluetooth [Bluetooth]: Add endian annotations to the core 2005-11-08 09:57:21 -08:00
cdrom [PATCH] drivers/cdrom: kmalloc + memset -> kzalloc conversion 2005-11-07 07:53:59 -08:00
char mm: re-architect the VM_UNPAGED logic 2005-11-28 14:34:23 -08:00
connector [PATCH] Process Events Connector 2005-11-07 07:53:35 -08:00
cpufreq [PATCH] clean up lock_cpu_hotplug() in cpufreq 2005-11-28 14:42:23 -08:00
crypto [PATCH] CONFIG_IA32 2005-10-30 17:37:10 -08:00
dio [PATCH] drivers/dio: kmalloc + memset -> kzalloc conversion 2005-11-07 07:53:59 -08:00
eisa [PATCH] drivers/eisa: kmalloc + memset -> kzalloc conversion 2005-11-07 07:53:59 -08:00
fc4 [PATCH] kfree cleanup: misc remaining drivers 2005-11-07 07:54:05 -08:00
firmware [PATCH] dell_rbu driver depends on x86[64] 2005-11-22 09:13:44 -08:00
hwmon [PATCH] hwmon: hdaps missing an axis 2005-11-23 23:04:27 -08:00
i2c [PATCH] Fix IXP4xx I2C driver build breakage 2005-11-17 11:23:48 -08:00
ide [PATCH] ide: add missing __init tags to device drivers 2005-11-19 22:24:35 +01:00
ieee1394 sbp2_command_orb_lock must be held when accessing the _orb_inuse list. 2005-11-18 16:41:39 -05:00
infiniband [PATCH] drivers/infiniband/core/mad.c: fix use-after-release case 2005-11-27 20:23:13 -08:00
input Input: make serio and gameport more swsusp friendly 2005-11-20 00:56:43 -05:00
isdn [PARISC] Mark hisax and pcbit ISDN drivers as not for parisc 2005-11-18 16:20:10 -05:00
macintosh macintosh: Always export pmu_[un]register_sleep_notifier if CONFIG_PM set 2005-11-08 12:14:50 +11:00
mca [PATCH] fix missing includes 2005-10-30 17:37:32 -08:00
md [PATCH] md: improve read speed to raid10 arrays using 'far copies' 2005-11-28 14:42:25 -08:00
media [PATCH] fix broken hybrid v4l-dvb frontend selection 2005-11-28 14:42:25 -08:00
message [PATCH] drivers/message/i2o/pci.c: fix a NULL pointer dereference 2005-11-27 20:22:32 -08:00
mfd [DRIVER MODEL] Convert platform drivers to use struct platform_driver 2005-11-09 22:32:44 +00:00
misc Merge master.kernel.org:/home/rmk/linux-2.6-drvmodel 2005-11-11 09:24:26 -08:00
mmc [MMC] mmci doesn't need asm/irq.h 2005-11-12 17:26:21 +00:00
mtd Merge master.kernel.org:/home/rmk/linux-2.6-drvmodel 2005-11-19 15:24:42 -08:00
net [PATCH] net: Fix compiler-error on dgrs.c when !CONFIG_PCI 2005-11-22 09:13:41 -08:00
nubus
oprofile
parisc [PARISC] Make superio.c initialize before any driver needs it 2005-11-17 16:44:57 -05:00
parport [PATCH] kfree cleanup: misc remaining drivers 2005-11-07 07:54:05 -08:00
pci [PATCH] PCI: kernel-doc fix for pci-acpi.c 2005-11-23 23:04:27 -08:00
pcmcia [PATCH] m32r: M3A-2170(Mappi-III) IDE support 2005-11-28 14:42:24 -08:00
pnp [PATCH] drivers/pnp/: cleanups 2005-11-07 07:54:09 -08:00
rapidio [PATCH] rapidio: message interface updates 2005-11-07 07:53:47 -08:00
s390 [PATCH] s390: fix class_device_create calls in 3270 the driver 2005-11-18 07:49:46 -08:00
sbus [SPARC]: drivers/sbus/char/aurora.c: "extern inline" -> "static inline" 2005-11-22 15:30:29 -08:00
scsi [PATCH] drivers/scsi/dpt_i2o.c: fix a NULL pointer dereference 2005-11-27 20:23:46 -08:00
serial [SERIAL] imx: Fix missed platform_driver_unregister 2005-11-21 17:05:21 +00:00
sh [PATCH] superhyway: multiple block support and VCR rework 2005-11-07 07:53:28 -08:00
sn
tc [MIPS] zs.c: Resurrect the deceased zs.c for now. 2005-11-17 16:23:39 +00:00
telephony [PATCH] changing CONFIG_LOCALVERSION rebuilds too much, for no good reason 2005-11-09 07:55:57 -08:00
usb [PATCH] usb serial: remove redundant include 2005-11-23 23:04:28 -08:00
video [PATCH] Console rotation fixes 2005-11-28 14:42:23 -08:00
w1 [PATCH] kfree cleanup: misc remaining drivers 2005-11-07 07:54:05 -08:00
zorro [PATCH] fix missing includes 2005-10-30 17:37:32 -08:00
Kconfig
Makefile [PATCH] RapidIO support: core base 2005-11-07 07:53:46 -08:00