Hou Tao 9c42652f8b selftests/bpf: Add benchmark for bpf_strncmp() helper ... Add benchmark to compare the performance between home-made strncmp() in bpf program and bpf_strncmp() helper. In summary, the performance win of bpf_strncmp() under x86-64 is greater than 18% when the compared string length is greater than 64, and is 179% when the length is 4095. Under arm64 the performance win is even bigger: 33% when the length is greater than 64 and 600% when the length is 4095. The following is the details: no-helper-X: use home-made strncmp() to compare X-sized string helper-Y: use bpf_strncmp() to compare Y-sized string Under x86-64: no-helper-1 3.504 ± 0.000M/s (drops 0.000 ± 0.000M/s) helper-1 3.347 ± 0.001M/s (drops 0.000 ± 0.000M/s) no-helper-8 3.357 ± 0.001M/s (drops 0.000 ± 0.000M/s) helper-8 3.307 ± 0.001M/s (drops 0.000 ± 0.000M/s) no-helper-32 3.064 ± 0.000M/s (drops 0.000 ± 0.000M/s) helper-32 3.253 ± 0.001M/s (drops 0.000 ± 0.000M/s) no-helper-64 2.563 ± 0.001M/s (drops 0.000 ± 0.000M/s) helper-64 3.040 ± 0.001M/s (drops 0.000 ± 0.000M/s) no-helper-128 1.975 ± 0.000M/s (drops 0.000 ± 0.000M/s) helper-128 2.641 ± 0.000M/s (drops 0.000 ± 0.000M/s) no-helper-512 0.759 ± 0.000M/s (drops 0.000 ± 0.000M/s) helper-512 1.574 ± 0.000M/s (drops 0.000 ± 0.000M/s) no-helper-2048 0.329 ± 0.000M/s (drops 0.000 ± 0.000M/s) helper-2048 0.602 ± 0.000M/s (drops 0.000 ± 0.000M/s) no-helper-4095 0.117 ± 0.000M/s (drops 0.000 ± 0.000M/s) helper-4095 0.327 ± 0.000M/s (drops 0.000 ± 0.000M/s) Under arm64: no-helper-1 2.806 ± 0.004M/s (drops 0.000 ± 0.000M/s) helper-1 2.819 ± 0.002M/s (drops 0.000 ± 0.000M/s) no-helper-8 2.797 ± 0.109M/s (drops 0.000 ± 0.000M/s) helper-8 2.786 ± 0.025M/s (drops 0.000 ± 0.000M/s) no-helper-32 2.399 ± 0.011M/s (drops 0.000 ± 0.000M/s) helper-32 2.703 ± 0.002M/s (drops 0.000 ± 0.000M/s) no-helper-64 2.020 ± 0.015M/s (drops 0.000 ± 0.000M/s) helper-64 2.702 ± 0.073M/s (drops 0.000 ± 0.000M/s) no-helper-128 1.604 ± 0.001M/s (drops 0.000 ± 0.000M/s) helper-128 2.516 ± 0.002M/s (drops 0.000 ± 0.000M/s) no-helper-512 0.699 ± 0.000M/s (drops 0.000 ± 0.000M/s) helper-512 2.106 ± 0.003M/s (drops 0.000 ± 0.000M/s) no-helper-2048 0.215 ± 0.000M/s (drops 0.000 ± 0.000M/s) helper-2048 1.223 ± 0.003M/s (drops 0.000 ± 0.000M/s) no-helper-4095 0.112 ± 0.000M/s (drops 0.000 ± 0.000M/s) helper-4095 0.796 ± 0.000M/s (drops 0.000 ± 0.000M/s) Signed-off-by: Hou Tao <houtao1@huawei.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20211210141652.877186-4-houtao1@huawei.com		2021-12-11 17:40:23 -08:00
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accounting
arch	tools headers UAPI: Sync x86's asm/kvm.h with the kernel sources	2021-11-18 10:08:07 -03:00
bootconfig	bootconfig: Cleanup dummy headers in tools/bootconfig	2021-10-10 22:16:02 -04:00
bpf	Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next	2021-12-10 15:56:13 -08:00
build	Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next	2021-12-10 15:56:13 -08:00
cgroup
counter	tools/counter: Create Counter tools	2021-10-17 10:54:16 +01:00
debugging
edid
firewire
firmware
gpio
hv
iio
include	bpf: Add bpf_strncmp helper	2021-12-11 17:40:23 -08:00
io_uring
kvm/kvm_stat	KVM: kvm_stat: do not show halt_wait_ns	2021-10-18 14:07:18 -04:00
laptop
leds
lib	libbpf: Fix gen_loader assumption on number of programs.	2021-12-11 17:16:19 -08:00
memory-model
objtool	objtool: Fix pv_ops noinstr validation	2021-12-03 09:11:42 +01:00
pci
pcmcia
perf	Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next	2021-12-10 15:56:13 -08:00
power
rcu	tools/rcu: Add an extract-stall script	2021-09-16 10:31:26 -07:00
scripts	tools, build: Add RISC-V to HOSTARCH parsing	2021-11-01 17:08:21 +01:00
spi
testing	selftests/bpf: Add benchmark for bpf_strncmp() helper	2021-12-11 17:40:23 -08:00
thermal/tmon
time
tracing	tools/latency-collector: Use correct size when writing queue_full_warning	2021-10-25 22:27:19 -04:00
usb	usb: testusb: Fix for showing the connection speed	2021-09-14 10:31:41 +02:00
virtio
vm	tools/vm/page-types.c: print file offset in hexadecimal	2021-11-06 13:30:40 -07:00
wmi
Makefile	tools/lib/lockdep: drop liblockdep	2021-11-12 11:07:17 -08:00