tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
1
fork

Configure Feed

Select the types of activity you want to include in your feed.

tcp: use __skb_push() in __tcp_transmit_skb()

We trust MAX_TCP_HEADER to be large enough.

Using the inlined version of skb_push() trades 8 bytes
of text for better performance of TCP TX fast path.

$ scripts/bloat-o-meter -t vmlinux.old vmlinux.new
add/remove: 0/0 grow/shrink: 1/0 up/down: 8/0 (8)
Function old new delta
__tcp_transmit_skb 3181 3189 +8
Total: Before=24896035, After=24896043, chg +0.00%

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260203044226.3489941-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

authored by

Eric Dumazet and committed by
Jakub Kicinski 59b5e7f4 333225e1

+1 -1
+1 -1
net/ipv4/tcp_output.c
··· 1573 1573 */ 1574 1574 skb->pfmemalloc = 0; 1575 1575 1576 - skb_push(skb, tcp_header_size); 1576 + __skb_push(skb, tcp_header_size); 1577 1577 skb_reset_transport_header(skb); 1578 1578 1579 1579 skb_orphan(skb);