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author | Jakub Kicinski <kuba@kernel.org> | 2024-03-08 08:12:45 +0300 |
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committer | Jakub Kicinski <kuba@kernel.org> | 2024-03-08 08:12:46 +0300 |
commit | e8bb2ccff7216d520a7bc33c22484dafebe8147e (patch) | |
tree | 29b291f5ccbeb9324f98f48e352a84d311314f69 /Documentation/networking | |
parent | d3423ed9b89d27d0fd8386dbb9bee89728c92b87 (diff) | |
parent | ce7f49ab741591d83e33e56948bac2f12de6e14e (diff) | |
download | linux-e8bb2ccff7216d520a7bc33c22484dafebe8147e.tar.xz |
Merge branch 'net-group-together-hot-data'
Eric Dumazet says:
====================
net: group together hot data
While our recent structure reorganizations were focused
on increasing max throughput, there is still an
area where improvements are much needed.
In many cases, a cpu handles one packet at a time,
instead of a nice batch.
Hardware interrupt.
-> Software interrupt.
-> Network/Protocol stacks.
If the cpu was idle or busy in other layers,
it has to pull many cache lines.
This series adds a new net_hotdata structure, where
some critical (and read-mostly) data used in
rx and tx path is packed in a small number of cache lines.
Synthetic benchmarks will not see much difference,
but latency of single packet should improve.
net_hodata current size on 64bit is 416 bytes,
but might grow in the future.
Also move RPS definitions to a new include file.
====================
Link: https://lore.kernel.org/r/20240306160031.874438-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'Documentation/networking')
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