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When we have a (very) large number of nexthops, they do not fit within a single message. rtm_dump_walk_nexthops() thus will be called repeatedly and ctx->idx is used to avoid dumping the same nexthops again. The approach in which we avoid dumping the same nexthops is by basically walking the entire nexthop rb-tree from the left-most node until we find a node whose id is >= s_idx. That does not scale well. Instead of this inefficient approach, rather go directly through the tree to the nexthop that should be dumped (the one whose nh_id >= s_idx). This allows us to find the relevant node in O(log(n)). We have quite a nice improvement with this: Before: ======= --> ~1M nexthops: $ time ~/libnl/src/nl-nh-list | wc -l 1050624 real 0m21.080s user 0m0.666s sys 0m20.384s --> ~2M nexthops: $ time ~/libnl/src/nl-nh-list | wc -l 2101248 real 1m51.649s user 0m1.540s sys 1m49.908s After: ====== --> ~1M nexthops: $ time ~/libnl/src/nl-nh-list | wc -l 1050624 real 0m1.157s user 0m0.926s sys 0m0.259s --> ~2M nexthops: $ time ~/libnl/src/nl-nh-list | wc -l 2101248 real 0m2.763s user 0m2.042s sys 0m0.776s Signed-off-by: Christoph Paasch <cpaasch@openai.com> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org> Reviewed-by: Eric Dumazet <edumazet@google.com> Reviewed-by: David Ahern <dsahern@kernel.org> Link: https://patch.msgid.link/20250816-nexthop_dump-v2-1-491da3462118@openai.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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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.