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| author | Paolo Abeni <pabeni@redhat.com> | 2024-02-20 12:00:01 +0100 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-02-21 17:05:01 -0800 |
| commit | f796feabb9f5b1e5c48780a7a0023ab4b82336dd (patch) | |
| tree | f50132512a9ed9f9a500aa2b79140f5cde52e8be /Documentation/networking | |
| parent | 26b2a265d888f7e345c6a461ab5f6d430791d09d (diff) | |
| download | linux-f796feabb9f5b1e5c48780a7a0023ab4b82336dd.tar.gz linux-f796feabb9f5b1e5c48780a7a0023ab4b82336dd.tar.bz2 linux-f796feabb9f5b1e5c48780a7a0023ab4b82336dd.zip | |
udp: add local "peek offset enabled" flag
We want to re-organize the struct sock layout. The sk_peek_off
field location is problematic, as most protocols want it in the
RX read area, while UDP wants it on a cacheline different from
sk_receive_queue.
Create a local (inside udp_sock) copy of the 'peek offset is enabled'
flag and place it inside the same cacheline of reader_queue.
Check such flag before reading sk_peek_off. This will save potential
false sharing and cache misses in the fast-path.
Tested under UDP flood with small packets. The struct sock layout
update causes a 4% performance drop, and this patch restores completely
the original tput.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/67ab679c15fbf49fa05b3ffe05d91c47ab84f147.1708426665.git.pabeni@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'Documentation/networking')
0 files changed, 0 insertions, 0 deletions