github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-10 23:53:52 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph
ed032fd4d8
linux/drivers
History
James Bottomley 7c8b65e18d SCSI: sd: fix array cache flushing bug causing performance problems 
commit 39c60a0948 upstream.

Some arrays synchronize their full non volatile cache when the sd driver sends
a SYNCHRONIZE CACHE command.  Unfortunately, they can have Terrabytes of this
and we send a SYNCHRONIZE CACHE for every barrier if an array reports it has a
writeback cache.  This leads to massive slowdowns on journalled filesystems.

The fix is to allow userspace to turn off the writeback cache setting as a
temporary measure (i.e. without doing the MODE SELECT to write it back to the
device), so even though the device reported it has a writeback cache, the
user, knowing that the cache is non volatile and all they care about is
filesystem correctness, can turn that bit off in the kernel and avoid the
performance ruinous (and safety irrelevant) SYNCHRONIZE CACHE commands.

The way you do this is add a 'temporary' prefix when performing the usual
cache setting operations, so

echo temporary write through > /sys/class/scsi_disk/<disk>/cache_type

Reported-by: Ric Wheeler <rwheeler@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-05-19 10:54:39 -07:00
..
accessibility
acpi ACPICA: Fix possible buffer overflow during a field unit read operation 2013-05-19 10:54:35 -07:00
amba ARM: 7366/3: amba: Remove AMBA level regulator support 2012-04-13 14:04:08 +01:00
ata ata_piix: Fix DVD not dectected at some Haswell platforms 2013-04-12 09:38:45 -07:00
atm atm/iphase: rename fregt_t -> ffreg_t 2013-02-14 10:49:05 -08:00
auxdisplay
base regmap: cache Fix regcache-rbtree sync 2013-04-12 09:38:43 -07:00
bcma bcma: mips: fix clearing device IRQ 2013-01-17 08:50:41 -08:00
block Revert "xen/blkback: Don't trust the handle from the frontend." 2013-04-05 10:04:52 -07:00
bluetooth Bluetooth: Add support for Dell[QCA 0cf3:817a] 2013-04-05 10:04:15 -07:00
cdrom
char vm: convert HPET mmap to vm_iomap_memory() helper 2013-04-25 21:19:56 -07:00
clk clk: Check parent for NULL in clk_change_rate 2012-07-19 08:58:59 -07:00
clocksource Revert "clocksource: Load the ACPI PM clocksource asynchronously" 2012-04-12 00:05:05 +02:00
connector
cpufreq cpufreq / Longhaul: Disable driver by default 2013-05-11 13:48:10 -07:00
cpuidle Merge branches 'idle-fix' and 'misc' into release 2012-04-06 21:48:59 -04:00
crypto crypto: mv_cesa requires on CRYPTO_HASH to build 2012-05-15 01:10:06 +00:00
dca dca: check against empty dca_domains list before unregister provider 2013-02-28 06:59:06 -08:00
devfreq ARM: global cleanups 2012-03-27 16:03:32 -07:00
dio
dma ioat: Fix DMA memory sync direction correct flag 2013-01-27 20:47:44 -08:00
edac EDAC: Test correct variable in ->store function 2013-02-03 18:24:41 -06:00
eisa EISA/PCI: Fix bus res reference 2013-04-12 09:38:44 -07:00
firewire firewire: add minor number range check to fw_device_init() 2013-03-04 06:06:41 +08:00
firmware efivars: Handle duplicate names from get_next_variable() 2013-04-05 10:04:36 -07:00
gpio gpiolib: Don't return -EPROBE_DEFER to sysfs, or for invalid gpios 2012-11-05 09:50:41 +01:00
gpu drm/radeon: fix handling of v6 power tables 2013-05-11 13:48:14 -07:00
hid HID: usbhid: quirk for Realtek Multi-card reader 2013-04-05 10:04:16 -07:00
hsi HSI: hsi_char: Remove max_data_size from sysfs 2012-04-23 14:23:32 +03:00
hv Drivers: hv: Cleanup error handling in vmbus_open() 2012-10-31 10:02:58 -07:00
hwmon hwmon: (sht15) Fix memory leak if regulator_enable() fails 2013-03-20 13:05:00 -07:00
hwspinlock hwspinlock: fix __hwspin_lock_request error path 2013-04-12 09:38:46 -07:00
i2c i2c: xiic: must always write 16-bit words to TX_FIFO 2013-05-07 19:51:54 -07:00
ide Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
idle simple_open: automatically convert to simple_open() 2012-04-05 15:25:50 -07:00
ieee802154
infiniband IPoIB: Fix send lockup due to missed TX completion 2013-03-28 12:12:25 -07:00
input Input: sentelic - only report position of first finger as ST coordinates 2013-01-11 09:06:56 -08:00
iommu iommu/amd: Make sure dma_ops are set for hotplug devices 2013-04-05 10:04:18 -07:00
isdn isdn/gigaset: fix zero size border case in debug dump 2013-02-14 10:49:04 -08:00
leds drivers/leds/leds-lp5521.c: fix lp5521_read() error handling 2012-12-03 11:46:36 -08:00
lguest
macintosh Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
mca
md dm snapshot: fix error return code in snapshot_ctr 2013-05-19 10:54:37 -07:00
media media: rc: unlock on error in show_protocols() 2013-03-04 06:06:41 +08:00
memstick memstick: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:19 +08:00
message Disintegrate and delete asm/system.h 2012-03-28 15:58:21 -07:00
mfd mfd: adp5520: Restore mode bits on resume 2013-05-07 19:51:57 -07:00
misc SGI-XP: handle non-fatal traps 2013-01-11 09:06:29 -08:00
mmc mmc: atmel-mci: pio hang on block errors 2013-05-07 19:51:57 -07:00
mtd vm: convert mtdchar mmap to vm_iomap_memory() helper 2013-04-25 21:19:56 -07:00
net r8169: fix 8168evl frame padding. 2013-05-11 13:48:09 -07:00
nfc NFC: pn533: Fix mem leak in pn533_in_dep_link_up 2012-12-03 11:47:12 -08:00
nubus Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
of gpio: Fix range check in of_gpio_simple_xlate() 2012-04-10 14:20:56 -06:00
oprofile oprofile: perf: use NR_CPUS instead or nr_cpumask_bits for static array 2012-07-16 09:04:21 -07:00
parisc parisc: move definition of PAGE0 to asm/page.h 2012-05-10 15:12:08 -07:00
parport
pci PCI/PM: Fix fallback to PCI_D0 in pci_platform_power_transition() 2013-05-07 19:51:55 -07:00
pcmcia pcmcia/vrc4171: Add missing spinlock init 2013-02-28 06:59:05 -08:00
pinctrl pinctrl: tegra: set low power mode bank width to 2 2012-10-28 10:14:14 -07:00
platform hp_accel: Ignore the error from lis3lv02d_poweron() at resume 2013-05-19 10:54:38 -07:00
pnp pnpacpi: fix incorrect TEST_ALPHA() test 2013-01-11 09:06:29 -08:00
power ab8500_btemp: Demote initcall sequence 2013-03-04 06:06:44 +08:00
pps
ps3
ptp ptp_pch: Add missing #include <linux/slab.h> 2012-05-16 14:44:44 -04:00
rapidio rapidio/tsi721: fix unused variable compiler warning 2012-09-14 10:00:20 -07:00
regulator regulator: wm831x: Set the new rather than old value for DVS VSEL 2013-01-17 08:50:41 -08:00
remoteproc remoteproc: fix a potential NULL-dereference on cleanup 2012-10-07 08:32:28 -07:00
rpmsg rpmsg: fix dependency on initialization order 2012-07-19 08:58:57 -07:00
rtc drivers/rtc/rtc-cmos.c: don't disable hpet emulation on suspend 2013-05-07 19:51:56 -07:00
s390 s390/memory hotplug: prevent offline of active memory increments 2013-05-07 19:51:53 -07:00
sbus Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
scsi SCSI: sd: fix array cache flushing bug causing performance problems 2013-05-19 10:54:39 -07:00
sfi
sh SuperH updates for 3.4 merge window 2012-03-30 00:09:17 -07:00
sn
spi spi/mpc512x-psc: optionally keep PSC SS asserted across xfer segmensts 2013-04-12 09:38:43 -07:00
ssb ssb: implement spurious tone avoidance 2013-04-25 21:19:55 -07:00
staging staging: comedi: s626: fix continuous acquisition 2013-04-05 10:04:15 -07:00
target target: Fix incorrect fallthrough of ALUA Standby/Offline/Transition CDBs 2013-04-16 21:27:26 -07:00
tc
thermal thermal: return an error on failure to register thermal class 2013-04-12 09:38:47 -07:00
tty tty: fix up atime/mtime mess, take three 2013-05-07 19:51:53 -07:00
uio
usb xhci: Don't warn on empty ring for suspended devices. 2013-05-11 13:48:08 -07:00
uwb uwb: fix error handling 2012-04-18 13:15:51 -07:00
vhost vhost/net: fix heads usage of ubuf_info 2013-03-28 12:11:54 -07:00
video fbcon: when font is freed, clear also vc_font.data 2013-05-07 19:51:53 -07:00
virt
virtio virtio: force vring descriptors to be allocated from lowmem 2013-01-11 09:06:47 -08:00
vlynq
w1 w1: fix oops when w1_search is called from netlink connector 2013-03-20 13:04:59 -07:00
watchdog hpwdt: Fix kdump issue in hpwdt 2012-10-02 10:30:08 -07:00
xen xen/pciback: Don't disable a PCI device that is already disabled. 2013-03-20 13:04:57 -07:00
zorro
Kconfig Merge branch 'for-next' of git://gitorious.org/kernel-hsi/kernel-hsi 2012-04-02 09:50:40 -07:00
Makefile Merge branch 'for-next' of git://gitorious.org/kernel-hsi/kernel-hsi 2012-04-02 09:50:40 -07:00