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Eric Dumazet says: ==================== udp: increase RX performance under stress This series is the result of careful analysis of UDP stack, to optimize the receive side, especially when under one or several UDP sockets are receiving a DDOS attack. I have measured a 47 % increase of throughput when using IPv6 UDP packets with 120 bytes of payload, under DDOS. 16 cpus are receiving traffic targeting a single socket. Even after adding NUMA aware drop counters, we were suffering from false sharing between packet producers and the consumer. 1) First four patches are shrinking struct ipv6_pinfo size and reorganize fields to get more efficient TX path. They should also benefit TCP, by removing one cache line miss. 2) patches 5 & 6 changes how sk->sk_rmem_alloc is read and updated. They reduce reduce spinlock contention on the busylock. 3) Patches 7 & 8 change the ordering of sk_backlog (including sk_rmem_alloc) sk_receive_queue and sk_drop_counters for better data locality. 4) Patch 9 removes the hashed array of spinlocks in favor of a per-udp-socket one. 5) Final patch adopts skb_attempt_defer_free(), after TCP got good results with it. ==================== Link: https://patch.msgid.link/20250916160951.541279-1-edumazet@google.com Signed-off-by: Paolo Abeni <pabeni@redhat.com> |
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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.