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tcp: move sysctl_tcp_shrink_window to netns_ipv4_read_txrx group

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Commit 18fd64d254 ("netns-ipv4: reorganize netns_ipv4 fast path
variables") missed that __tcp_select_window() is reading
net->ipv4.sysctl_tcp_shrink_window.

Move this field to netns_ipv4_read_txrx group, as __tcp_select_window()
is used both in tx and rx paths.

Saves a potential cache line miss.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260307092214.2433548-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2026-03-07 09:22:14 +00:00 committed by Jakub Kicinski
parent bf3471e6e6
commit e8eb33d650
1 changed files with 1 additions and 1 deletions
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2
include/net/netns/ipv4.h
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@ -74,6 +74,7 @@ struct netns_ipv4 {
/* TXRX readonly hotpath cache lines */
__cacheline_group_begin(netns_ipv4_read_txrx);
u8 sysctl_tcp_shrink_window;
__cacheline_group_end(netns_ipv4_read_txrx);
/* RX readonly hotpath cache line */
@ -122,7 +123,6 @@ struct netns_ipv4 {
#endif
bool fib_has_custom_local_routes;
bool fib_offload_disabled;
u8 sysctl_tcp_shrink_window;
#ifdef CONFIG_IP_ROUTE_CLASSID
atomic_t fib_num_tclassid_users;
#endif