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Paolo Abeni db688c24ea vhost_net: use packet weight for rx handler, too 
Similar to commit a2ac99905f ("vhost-net: set packet weight of
tx polling to 2 * vq size"), we need a packet-based limit for
handler_rx, too - elsewhere, under rx flood with small packets,
tx can be delayed for a very long time, even without busypolling.

The pkt limit applied to handle_rx must be the same applied by
handle_tx, or we will get unfair scheduling between rx and tx.
Tying such limit to the queue length makes it less effective for
large queue length values and can introduce large process
scheduler latencies, so a constant valued is used - likewise
the existing bytes limit.

The selected limit has been validated with PVP[1] performance
test with different queue sizes:

queue size		256	512	1024

baseline		366	354	362
weight 128		715	723	670
weight 256		740	745	733
weight 512		600	460	583
weight 1024		423	427	418

A packet weight of 256 gives peek performances in under all the
tested scenarios.

No measurable regression in unidirectional performance tests has
been detected.

[1] https://developers.redhat.com/blog/2017/06/05/measuring-and-comparing-open-vswitch-performance/

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2018-04-24 10:02:13 -04:00
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accessibility
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acpi xen: fixes for 4.17-rc1 2018-04-12 11:04:35 -07:00
amba
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android
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ata Merge branch 'for-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2018-04-03 17:42:25 -07:00
atm atm: iphase: fix spelling mistake: "Tansmit" -> "Transmit" 2018-04-19 13:41:49 -04:00
auxdisplay
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base mm: check __highest_present_section_nr directly in memory_dev_init() 2018-04-11 10:28:31 -07:00
bcma
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block rbd: notrim map option 2018-04-16 09:38:40 +02:00
bluetooth Bluetooth: Set HCI_QUIRK_SIMULTANEOUS_DISCOVERY for BTUSB_QCA_ROME 2018-04-01 21:43:02 +03:00
bus pci-v4.17-changes 2018-04-06 18:31:06 -07:00
cdrom
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char RTC for 4.17 2018-04-10 10:22:27 -07:00
clk The large diff this time around is from the addition of a new clk driver 2018-04-13 15:51:06 -07:00
clocksource Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-04-16 12:44:03 -07:00
connector
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cpufreq cpufreq: Drop cpufreq_table_validate_and_show() 2018-04-10 08:40:45 +02:00
cpuidle cpuidle: menu: Avoid selecting shallow states with stopped tick 2018-04-09 11:54:57 +02:00
crypto .gitignore: move *-asn1.[ch] patterns to the top-level .gitignore 2018-04-07 19:04:02 +09:00
dax libnvdimm for 4.17 2018-04-10 10:25:57 -07:00
dca dca: make function dca_common_get_tag static 2018-04-23 21:02:41 -04:00
devfreq
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dio
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dma DMAengine updates for v4.17-rc1 2018-04-10 12:14:37 -07:00
dma-buf
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edac * Add NVDIMM support to EDAC (Tony Luck) 2018-04-05 14:21:13 -07:00
eisa
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extcon Char/Misc patches for 4.17-rc1 2018-04-04 20:07:20 -07:00
firewire
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firmware Merge branch 'dmi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging 2018-04-13 16:32:16 -07:00
fmc treewide: Fix typos in printk 2018-03-27 09:51:22 +02:00
fpga
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fsi
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gpio DeviceTree updates for 4.17: 2018-04-05 21:03:42 -07:00
gpu amdgpu, omap and snd regression fix 2018-04-12 20:56:10 -07:00
hid HID: i2c-hid: fix inverted return value from i2c_hid_command() 2018-04-19 09:25:15 +02:00
hsi
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hv ARM: 2018-04-09 11:42:31 -07:00
hwmon hwmon updates for v4.17 2018-04-09 19:59:54 -07:00
hwspinlock
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hwtracing Char/Misc patches for 4.17-rc1 2018-04-04 20:07:20 -07:00
i2c i2c: add param sanity check to i2c_transfer() 2018-04-11 23:33:46 +02:00
ide for-4.17/block-20180402 2018-04-05 14:27:02 -07:00
idle
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iio This is the bulk of GPIO changes for the v4.17 kernel cycle: 2018-04-05 09:51:41 -07:00
infiniband Merge candidates for 4.17 merge window 2018-04-06 17:35:43 -07:00
input Changes to chrome-platform for v4.17 2018-04-13 16:20:36 -07:00
iommu IOMMU Updates for Linux v4.17 2018-04-11 18:50:41 -07:00
ipack
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irqchip IOMMU Updates for Linux v4.17 2018-04-11 18:50:41 -07:00
isdn mISDN: Remove VLAs 2018-04-12 21:46:10 -04:00
leds
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lightnvm lightnvm: pblk: remove some unnecessary NULL checks 2018-03-29 17:29:09 -06:00
macintosh powerpc updates for 4.17 2018-04-07 12:08:19 -07:00
mailbox
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mcb
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md Merge tag 'md/4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md 2018-04-20 10:39:44 -07:00
media remoteproc updates for v4.17 2018-04-10 12:09:27 -07:00
memory
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memstick
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message treewide: Align function definition open/close braces 2018-03-26 11:13:09 +02:00
mfd platform/chrome: mfd/cros_ec_dev: Add sysfs entry to set keyboard wake lid angle 2018-04-10 22:25:07 -07:00
misc * Fix 2032 time access issues and new compiler warnings 2018-04-12 10:21:19 -07:00
mmc MMC host: 2018-04-20 10:41:31 -07:00
mtd This pull request contains updates for both UBI and UBIFS: 2018-04-11 16:39:34 -07:00
mux
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net qed: Add configuration information to register dump and debug data 2018-04-23 12:05:57 -04:00
nfc
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ntb
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nubus
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nvdimm libnvdimm for 4.17 2018-04-10 10:25:57 -07:00
nvme nvme: expand nvmf_check_if_ready checks 2018-04-12 09:58:27 -06:00
nvmem Char/Misc patches for 4.17-rc1 2018-04-04 20:07:20 -07:00
of Kbuild updates for v4.17 (2nd) 2018-04-15 17:21:30 -07:00
opp
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oprofile oprofilefs: don't oops on allocation failure 2018-03-29 15:07:48 -04:00
parisc parisc/pci: Switch LBA PCI bus from Hard Fail to Soft Fail mode 2018-03-27 18:52:22 +02:00
parport Char/Misc patches for 4.17-rc1 2018-04-04 20:07:20 -07:00
pci PCI: Remove messages about reassigning resources 2018-04-11 08:46:50 -05:00
pcmcia Merge branch 'for-linus-sa1100' of git://git.armlinux.org.uk/~rmk/linux-arm 2018-04-09 09:26:36 -07:00
perf ARM: SoC driver updates for 4.17 2018-04-05 21:29:35 -07:00
phy ARM: SoC platform updates for 4.17 2018-04-05 21:21:08 -07:00
pinctrl This is the bulk of GPIO changes for the v4.17 kernel cycle: 2018-04-05 09:51:41 -07:00
platform Changes to chrome-platform for v4.17 2018-04-13 16:20:36 -07:00
pnp
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power ARM: SoC platform updates for 4.17 2018-04-05 21:21:08 -07:00
powercap
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pps
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ps3
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ptp
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pwm pwm: Changes for v4.17-rc1 2018-04-13 15:46:21 -07:00
rapidio rapidio: use a reference count for struct mport_dma_req 2018-04-11 10:28:37 -07:00
ras
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regulator Merge remote-tracking branches 'regulator/topic/88pg86x', 'regulator/topic/dt', 'regulator/topic/formatting' and 'regulator/topic/gpio' into regulator-next 2018-03-28 10:33:53 +08:00
remoteproc remoteproc: fix null pointer dereference on glink only platforms 2018-04-05 22:53:16 -07:00
reset Merge branch 'reset/lookup' into reset/next 2018-03-27 11:03:43 +02:00
rpmsg rpmsg: smd: Use announce_create to process any receive work 2018-03-27 21:54:37 -07:00
rtc RTC for 4.17 2018-04-10 10:22:27 -07:00
s390 s390: remove couple of duplicate includes 2018-04-16 09:10:24 +02:00
sbus sparc64: Properly range check DAX completion index 2018-04-01 20:07:00 -04:00
scsi SCSI fixes on 20180415 2018-04-15 17:24:12 -07:00
sfi
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sh
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siox
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slimbus
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sn
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soc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-04-21 16:32:48 -04:00
soundwire
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spi spi: SPI updates for v4.17 2018-04-03 12:06:21 -07:00
spmi
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ssb
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staging page cache: use xa_lock 2018-04-11 10:28:39 -07:00
target for-4.17/block-20180402 2018-04-05 14:27:02 -07:00
tc
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tee
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thermal Merge branches 'thermal-core' and 'thermal-soc' into next 2018-04-13 14:11:53 +08:00
thunderbolt
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tty Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2018-04-09 09:04:10 -07:00
uio
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usb Merge branch 'next-general' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2018-04-07 11:11:41 -07:00
uwb
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vfio VFIO updates for v4.17-rc1 2018-04-06 19:44:27 -07:00
vhost vhost_net: use packet weight for rx handler, too 2018-04-24 10:02:13 -04:00
video fbdev changes for v4.17: 2018-04-10 10:20:00 -07:00
virt
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virtio virtio: feature 2018-04-11 18:58:27 -07:00
visorbus
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vlynq
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vme
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w1
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watchdog linux-watchdog 4.17-rc1 merge window tag 2018-04-13 15:43:50 -07:00
xen xen: fixes and one header update for 4.17-rc2 2018-04-20 08:36:04 -07:00
zorro
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Kconfig hwtracing: Add HW tracing support menu 2018-03-29 13:38:10 +03:00
Makefile
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