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Xu Kuohai f9db3a3822 selftests/bpf/benchs: Add overwrite mode benchmark for BPF ring buffer 
Add --rb-overwrite option to benchmark BPF ring buffer in overwrite mode.
Since overwrite mode is not yet supported by libbpf for consumer, also add
--rb-bench-producer option to benchmark producer directly without a consumer.

Benchmarks on an x86_64 and an arm64 CPU are shown below for reference.

- AMD EPYC 9654 (x86_64)

Ringbuf, multi-producer contention in overwrite mode, no consumer
=================================================================
rb-prod nr_prod 1    32.180 ± 0.033M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 2    9.617 ± 0.003M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 3    8.810 ± 0.002M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 4    9.272 ± 0.001M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 8    9.173 ± 0.001M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 12   3.086 ± 0.032M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 16   2.945 ± 0.021M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 20   2.519 ± 0.021M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 24   2.545 ± 0.021M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 28   2.363 ± 0.024M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 32   2.357 ± 0.021M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 36   2.267 ± 0.011M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 40   2.284 ± 0.020M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 44   2.215 ± 0.025M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 48   2.193 ± 0.023M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 52   2.208 ± 0.024M/s (drops 0.000 ± 0.000M/s)

- HiSilicon Kunpeng 920 (arm64)

Ringbuf, multi-producer contention in overwrite mode, no consumer
=================================================================
rb-prod nr_prod 1    14.478 ± 0.006M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 2    21.787 ± 0.010M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 3    6.045 ± 0.001M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 4    5.352 ± 0.003M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 8    4.850 ± 0.002M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 12   3.542 ± 0.016M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 16   3.509 ± 0.021M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 20   3.171 ± 0.010M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 24   3.154 ± 0.014M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 28   2.974 ± 0.015M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 32   3.167 ± 0.014M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 36   2.903 ± 0.010M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 40   2.866 ± 0.010M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 44   2.914 ± 0.010M/s (drops 0.000 ± 0.000M/s)
rb-prod nr_prod 48   2.806 ± 0.012M/s (drops 0.000 ± 0.000M/s)
Rb-prod nr_prod 52   2.840 ± 0.012M/s (drops 0.000 ± 0.000M/s)

Signed-off-by: Xu Kuohai <xukuohai@huawei.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20251018035738.4039621-4-xukuohai@huaweicloud.com
History 2025-10-27 19:47:32 -07:00
arch ARM: 2025-10-18 07:07:14 -10:00
block block-6.18-20251016 2025-10-17 08:31:26 -07:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto This push contains the following changes: 2025-10-10 08:56:16 -07:00
Documentation Rust 'rustfmt' cleanup 2025-10-18 10:05:13 -10:00
drivers Hi, 2025-10-18 08:38:28 -10:00
fs Description for this pull request: 2025-10-18 07:23:59 -10:00
include bpf: Add overwrite mode for BPF ring buffer 2025-10-27 19:42:39 -07:00
init printk changes for 6.18 2025-10-04 11:13:11 -07:00
io_uring io_uring/rw: check for NULL io_br_sel when putting a buffer 2025-10-15 13:38:53 -06:00
ipc namespace-6.18-rc1 2025-09-29 11:20:29 -07:00
kernel bpf: Add overwrite mode for BPF ring buffer 2025-10-27 19:42:39 -07:00
lib lib/freader: support reading more than 2 folios 2025-10-27 09:56:27 -07:00
LICENSES LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2 2025-07-24 11:15:39 +02:00
mm slab: reset slab->obj_ext when freeing and it is OBJEXTS_ALLOC_FAIL 2025-10-16 15:16:45 +02:00
net bpf: Do not let BPF test infra emit invalid GSO types to stack 2025-10-20 13:16:10 -07:00
rust rust: bitmap: fix formatting 2025-10-17 13:02:22 +02:00
samples samples/bpf: Fix spelling typos in samples/bpf 2025-10-18 19:26:23 -07:00
scripts Kbuild fixes for 6.18 #1 2025-10-11 15:47:12 -07:00
security integrity-v6.18 2025-10-05 10:48:33 -07:00
sound ALSA: hda/realtek: Fix mute led for HP Omen 17-cb0xxx 2025-10-17 16:37:21 +02:00
tools selftests/bpf/benchs: Add overwrite mode benchmark for BPF ring buffer 2025-10-27 19:47:32 -07:00
usr gen_init_cpio: Ignore fsync() returning EINVAL on pipes 2025-10-07 09:53:05 -07:00
virt KVM x86 fixes for 6.18: 2025-10-18 10:25:43 +02:00
.clang-format memblock: drop for_each_free_mem_pfn_range_in_zone_from() 2025-09-14 08:49:03 +03:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: remove Alyssa Rosenzweig 2025-09-18 21:17:31 +02:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore .gitignore: ignore compile_commands.json globally 2025-08-12 15:53:55 -07:00
.mailmap Including fixes from CAN 2025-10-16 09:41:21 -07:00
.pylintrc tools: docs: parse-headers.py: move it from sphinx dir 2025-08-29 15:54:42 -06:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS USB/Thunderbolt changes for 6.18-rc1 2025-10-04 16:07:08 -07:00
Kbuild sched: Make migrate_{en,dis}able() inline 2025-09-25 09:57:16 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS lib: move freader into buildid.h 2025-10-27 09:56:27 -07:00
Makefile Linux 6.18-rc1 2025-10-12 13:42:36 -07:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.