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Lars Ellenberg c13f7e1a94 drbd: don't recvmsg with zero length 
This should fix a performance degradation we observed recently.

If we don't expect any subheader, we should not call into the tcp stack,
as that may add considerable latency if there is no data available at
this point.

For a synthetic synchronous write load with single outstanding writes,
this additional latency when processing the "unplug remote" packet
added up to a performance degradation factor >= 10.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
 		2010-11-27 19:50:43 +01:00
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accessibility
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acpi ACPI: debugfs custom_method open to non-root 2010-11-13 09:52:16 -08:00
amba
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ata sata_via: apply magic FIFO fix to vt6420 too 2010-11-19 13:16:26 -05:00
atm solos: Refuse to upgrade firmware with older FPGA. It doesn't work. 2010-11-08 12:17:05 -08:00
auxdisplay
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base PM: Allow devices to be removed during late suspend and early resume 2010-11-11 01:50:53 +01:00
block drbd: don't recvmsg with zero length 2010-11-27 19:50:43 +01:00
bluetooth Bluetooth: Add MacBookAir3,1(2) support 2010-11-09 01:08:53 -02:00
cdrom
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char Char: virtio_console, fix memory leak 2010-11-24 15:21:12 +10:30
clocksource ARM: shmobile: remove sh_timer_config clk member 2010-10-31 10:40:39 -04:00
connector
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cpufreq
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cpuidle
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crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2010-11-13 09:55:56 -08:00
dca
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dio
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dma drivers/dma/Kconfig: add part number for Topcliff. 2010-10-29 14:14:02 -07:00
edac
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eisa
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firewire SCSI host lock push-down 2010-11-16 13:33:23 -08:00
firmware dmi: log board, system, and BIOS information 2010-10-27 18:03:05 -07:00
gpio gpio: Add VIA VX855 GPIO driver 2010-10-29 00:29:51 +02:00
gpu Merge branch 'drm-intel-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/ickle/drm-intel 2010-11-19 10:28:13 -08:00
hid BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
hwmon hwmon: (lis3lv02d_i2c) Fix compile warnings 2010-11-22 12:23:39 -08:00
i2c i2c: Sanity checks on adapter registration 2010-11-15 22:40:38 +01:00
ide
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idle
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ieee802154
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infiniband BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2010-11-19 10:31:04 -08:00
isdn Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2010-11-05 15:25:48 -07:00
leds drivers/leds/leds-lp5523.c: perform SW reset before detection 2010-11-25 06:50:44 +09:00
lguest
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macintosh drivers/macintosh/adb-iop.c: flags should be unsigned long 2010-11-12 07:55:30 -08:00
mca
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md md: Call blk_queue_flush() to establish flush/fua support 2010-11-24 16:40:33 +11:00
media BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
memstick
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message SCSI host lock push-down 2010-11-16 13:33:23 -08:00
mfd mfd: Fix a memory leak when unload mc13xxx-core module 2010-10-29 00:30:43 +02:00
misc drivers/misc/isl29020.c: remove incorrect kfree in isl29020_remove() 2010-11-25 06:50:47 +09:00
mmc mmc: sdhci: 8-bit bus width changes 2010-11-22 15:12:04 -05:00
mtd UBI: release locks in check_corruption 2010-11-19 15:19:40 +02:00
net Merge branch 'drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile 2010-11-25 07:42:03 +09:00
nubus
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of
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oprofile Merge branches 'perf-fixes-for-linus' and 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-10-30 11:43:26 -07:00
parisc BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
parport
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pci Merge branch 'drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile 2010-11-25 07:42:03 +09:00
pcmcia drivers/pcmcia/soc_common.c: Use printf extension %pV 2010-11-10 14:31:28 +01:00
platform
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pnp BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
power power: Revert "power_supply: Mark twl4030_charger as broken" 2010-10-29 00:30:44 +02:00
pps
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ps3
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rapidio rapidio: use resource_size() 2010-11-12 07:55:30 -08:00
regulator regulator: max8998 BUCK1/2 voltage change with use of GPIOs 2010-10-29 00:30:15 +02:00
rtc Merge branches 'sh/rtc' and 'common/clkfwk' into sh/urgent 2010-11-10 18:15:44 +09:00
s390 [S390] qdio: free indicator after reset is finished 2010-11-25 09:52:59 +01:00
sbus
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scsi SCSI: arm fas216: fix missing ';' 2010-11-23 22:26:23 +00:00
serial BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
sfi
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sh Merge branch 'common/clkfwk' into sh-fixes-for-linus 2010-11-19 16:43:23 +09:00
sn
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spi Merge branch 'next-spi' of git://git.secretlab.ca/git/linux-2.6 2010-11-01 07:50:43 -04:00
ssb
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staging Fix build failure at cx25821-video driver 2010-11-18 11:42:05 -08:00
tc
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telephony
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thermal
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tty Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2010-11-19 10:31:04 -08:00
uio
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usb Merge branch 'usb-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6 2010-11-24 08:21:43 +09:00
uwb UWB: Return UWB_RSV_ALLOC_NOT_FOUND rather than crashing on NULL dereference if kzalloc fails 2010-11-11 07:14:07 -08:00
vhost
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video Merge master.kernel.org:/home/rmk/linux-2.6-arm 2010-11-25 07:41:10 +09:00
virtio virtio: fix format of sysfs driver/vendor files 2010-11-24 15:21:12 +10:30
vlynq
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w1
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watchdog WATCHDOG: octeon-wdt: Use I/O clock rate for timing calculations. 2010-10-29 19:08:42 +01:00
xen Merge branch 'upstream/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen 2010-11-24 08:23:18 +09:00
zorro BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
Kconfig
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Makefile TTY: create drivers/tty and move the tty core files there 2010-11-05 08:10:33 -07:00