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Eric Dumazet 567e4b7973 net: rfs: add hash collision detection 
Receive Flow Steering is a nice solution but suffers from
hash collisions when a mix of connected and unconnected traffic
is received on the host, when flow hash table is populated.

Also, clearing flow in inet_release() makes RFS not very good
for short lived flows, as many packets can follow close().
(FIN , ACK packets, ...)

This patch extends the information stored into global hash table
to not only include cpu number, but upper part of the hash value.

I use a 32bit value, and dynamically split it in two parts.

For host with less than 64 possible cpus, this gives 6 bits for the
cpu number, and 26 (32-6) bits for the upper part of the hash.

Since hash bucket selection use low order bits of the hash, we have
a full hash match, if /proc/sys/net/core/rps_sock_flow_entries is big
enough.

If the hash found in flow table does not match, we fallback to RPS (if
it is enabled for the rxqueue).

This means that a packet for an non connected flow can avoid the
IPI through a unrelated/victim CPU.

This also means we no longer have to clear the table at socket
close time, and this helps short lived flows performance.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-02-08 16:53:57 -08:00
..
accessibility
acpi Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-02-05 14:33:28 -08:00
amba
android
ata libata: prevent HSM state change race between ISR and PIO 2015-01-19 14:11:23 -05:00
atm atm: remove deprecated use of pci api 2015-01-18 00:28:41 -05:00
auxdisplay
base Merge branches 'pm-domains', 'powercap' and 'pm-tools' 2014-12-29 21:24:00 +01:00
bcma bcma: use standard bus scanning during early register 2015-01-23 21:47:55 +02:00
block rbd: drop parent_ref in rbd_dev_unprobe() unconditionally 2015-01-28 16:12:02 +03:00
bluetooth Bluetooth: btusb: Add support for Lite-On (04ca) Broadcom based, BCM43142 2015-02-03 08:57:14 +01:00
bus mvebu fixes for 3.19. (Part 4) 2015-01-23 14:08:13 -08:00
cdrom
char ipmi: Fix compile warning with tv_usec 2014-12-30 13:34:36 -06:00
clk Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-01-27 16:59:56 -08:00
clocksource Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-01-27 16:59:56 -08:00
connector
coresight
cpufreq Merge branches 'pm-cpufreq' and 'pm-cpuidle' 2014-12-29 21:23:41 +01:00
cpuidle Merge branches 'pm-cpufreq' and 'pm-cpuidle' 2014-12-29 21:23:41 +01:00
crypto
dca
devfreq
dio
dma dmaengine: dw: balance PM runtime calls 2015-01-13 23:07:58 +05:30
dma-buf
edac
eisa
extcon
firewire
firmware
fmc
gpio gpio: sysfs: fix memory leak in gpiod_sysfs_set_active_low 2015-01-30 10:29:33 +01:00
gpu drm/cirrus: Limit modes depending on bpp option 2015-02-05 10:39:00 +10:00
hid HID: roccat: potential out of bounds in pyra_sysfs_write_settings() 2015-01-09 14:41:01 +01:00
hsi * misc. fixes in omap-ssi and nokia-modem drivers 2014-12-15 17:33:47 -08:00
hv
hwmon hwmon: (i5500_temp) Convert to use ATTRIBUTE_GROUPS macro 2015-01-24 14:16:22 +01:00
hwspinlock
i2c i2c: sh_mobile: terminate DMA reads properly 2015-01-30 17:58:43 +01:00
ide
idle
iio First round of IIO fixes for the 3.19 cycle. 2015-01-08 17:59:04 -08:00
infiniband Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-02-05 14:33:28 -08:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2015-02-01 13:16:40 -08:00
iommu iommu/tegra: gart: Provide default ->map_sg() callback 2015-01-26 13:41:07 +01:00
ipack
irqchip irqchip: atmel-aic-common: Prevent clobbering of priority when changing IRQ type 2015-01-07 12:41:45 +00:00
isdn drivers: isdn: isdnloop: isdnloop.c: Remove parenthesis around return values, as specified in CodingStyle. 2015-02-05 15:40:23 -08:00
leds leds: netxbig: fix oops at probe time 2015-01-13 13:49:01 -08:00
lguest
macintosh macintosh: therm_pm72: delete deprecated driver 2014-12-19 19:32:47 +01:00
mailbox
mcb mcb: mcb-pci: Only remap the 1st 0x200 bytes of BAR 0 2015-01-09 15:46:37 -08:00
md Two fixes for md 2015-02-03 19:54:57 -08:00
media media fixes for v3.19-rc6 2015-01-24 14:34:54 -08:00
memory MTD updates for 3.19: 2014-12-17 09:59:26 -08:00
memstick
message
mfd - Avoid platform ID collision in da9052 2015-01-21 18:29:44 +12:00
misc vmci: propagate msghdr all way down to __qp_memcpy_to_queue() 2015-02-04 01:34:14 -05:00
mmc mmc: sdhci: Set SDHCI_POWER_ON with external vmmc 2015-01-14 09:47:19 +01:00
mtd MTD updates for 3.19: 2014-12-17 09:59:26 -08:00
net net: rfs: add hash collision detection 2015-02-08 16:53:57 -08:00
nfc NFC: nci: Move NFCEE discovery logic 2015-02-04 09:15:18 +01:00
ntb
nubus
of of/unittest: Overlays with sub-devices tests 2015-01-23 13:10:07 +00:00
oprofile
parisc parisc/PCI: Clip bridge windows to fit in upstream windows 2015-01-16 10:04:43 -06:00
parport
pci PCI: Handle read-only BARs on AMD CS553x devices 2015-02-03 20:28:02 -06:00
pcmcia
phy Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-01-27 16:59:56 -08:00
pinctrl pinctrl: at91: allow to have disabled gpio bank 2015-01-26 09:13:36 +01:00
platform Revert "platform: x86: dell-laptop: Add support for keyboard backlight" 2015-01-23 11:10:32 -08:00
pnp
power More ACPI and power management updates for 3.19-rc1 2014-12-18 20:28:33 -08:00
powercap powercap / RAPL: add IDs for future Xeon CPUs 2014-12-17 02:35:42 +01:00
pps
ps3
ptp
pwm pwm: Changes for v3.19-rc1 2014-12-17 10:10:51 -08:00
rapidio
ras
regulator Merge remote-tracking branch 'regulator/fix/s2mps11' into regulator-linus 2015-01-16 12:05:35 +00:00
remoteproc
reset reset: sunxi: fix spinlock initialization 2015-01-16 19:11:31 -08:00
rpmsg
rtc drivers/rtc/rtc-s5m.c: terminate s5m_rtc_id array with empty element 2015-01-26 13:37:19 -08:00
s390 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-01-27 16:59:56 -08:00
sbus
scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-02-05 14:33:28 -08:00
sfi
sh
sn
soc Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2014-12-15 15:52:01 -08:00
spi Merge remote-tracking branches 'spi/fix/fsl-dspi' and 'spi/fix/imx' into spi-linus 2015-02-04 20:57:31 +00:00
spmi
ssb
staging Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-02-05 14:33:28 -08:00
target netlink: make nlmsg_end() and genlmsg_end() void 2015-01-18 01:03:45 -05:00
tc
thermal Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-01-27 16:59:56 -08:00
thunderbolt
tty serial: samsung: Add the support for Exynos5433 SoC 2015-01-09 13:46:02 -08:00
uio
usb usb: fixes for v3.19-rc6 2015-01-26 19:13:41 -08:00
uwb
vfio vfio-pci: Fix the check on pci device type in vfio_pci_probe() 2015-01-07 10:29:11 -07:00
vhost Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-02-05 14:33:28 -08:00
video fbdev/broadsheetfb: fix memory leak 2015-01-13 15:13:45 +02:00
virt
virtio virtio_pci: document why we defer kfree 2015-01-06 16:35:36 +02:00
vlynq
vme
w1
watchdog watchdog: drop owner assignment from platform_drivers 2015-01-21 14:52:34 +01:00
xen Merge remote-tracking branch 'scsi-queue/drivers-for-3.19' into for-linus 2014-12-18 05:56:29 -08:00
zorro
Kconfig drivers/Kconfig: remove duplicate entry for soc 2015-01-25 20:26:42 +08:00
Makefile drivers: Move iommu/ before gpu/ in Makefile 2014-12-22 11:47:37 +02:00