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Ilpo Järvinen 7885ce0147 tcp: try to avoid safer when ACKs are thinned 
Add newly acked pkts EWMA. When ACK thinning occurs, select
between safer and unsafe cep delta in AccECN processing based
on it. If the packets ACKed per ACK tends to be large, don't
conservatively assume ACE field overflow.

This patch uses the existing 2-byte holes in the rx group for new
u16 variables withtout creating more holes. Below are the pahole
outcomes before and after this patch:

[BEFORE THIS PATCH]
struct tcp_sock {
    [...]
    u32                        delivered_ecn_bytes[3]; /*  2744    12 */
    /* XXX 4 bytes hole, try to pack */

    [...]
    __cacheline_group_end__tcp_sock_write_rx[0];       /*  2816     0 */

    [...]
    /* size: 3264, cachelines: 51, members: 177 */
}

[AFTER THIS PATCH]
struct tcp_sock {
    [...]
    u32                        delivered_ecn_bytes[3]; /*  2744    12 */
    u16                        pkts_acked_ewma;        /*  2756     2 */
    /* XXX 2 bytes hole, try to pack */

    [...]
    __cacheline_group_end__tcp_sock_write_rx[0];       /*  2816     0 */

    [...]
    /* size: 3264, cachelines: 51, members: 178 */
}

Signed-off-by: Ilpo Järvinen <ij@kernel.org>
Co-developed-by: Chia-Yu Chang <chia-yu.chang@nokia-bell-labs.com>
Signed-off-by: Chia-Yu Chang <chia-yu.chang@nokia-bell-labs.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260131222515.8485-2-chia-yu.chang@nokia-bell-labs.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2026-02-03 15:13:24 +01:00
..
6lowpan net: replace ND_PRINTK with dynamic debug 2025-07-10 15:27:32 -07:00
9p - fix a bug with O_APPEND in cached mode causing data to be written multiple times on server 2025-12-07 08:29:09 -08:00
802 net: remove HIPPI support and RoadRunner HIPPI driver 2026-01-20 19:12:06 -08:00
8021q net: vlan: sync VLAN features with lower device 2025-10-31 17:42:35 -07:00
appletalk net: Convert proto_ops connect() callbacks to use sockaddr_unsized 2025-11-04 19:10:32 -08:00
atm Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-11-27 12:19:08 -08:00
ax25 net: ax25: remove plumbing for never-implemented DAMA Master support 2026-01-30 19:19:39 -08:00
batman-adv Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-10-31 06:46:03 -07:00
bluetooth Bluetooth: L2CAP: Fix not tracking outstanding TX ident 2026-01-29 13:36:35 -05:00
bpf bpf: Fix reference count leak in bpf_prog_test_run_xdp() 2026-01-12 16:37:40 -08:00
bridge Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-01-29 17:28:54 -08:00
caif caif: fix integer underflow in cffrml_receive() 2025-12-11 01:35:41 -08:00
can net: can: j1939: j1939_xtp_rx_rts_session_active(): deactivate session upon receiving the second rts 2026-01-15 09:52:39 +01:00
ceph libceph: make calc_target() set t->paused, not just clear it 2026-01-06 00:39:43 +01:00
core tcp: reduce tcp sockets size by one cache line 2026-01-30 17:15:51 -08:00
dcb Revert "Documentation: net: add flow control guide and document ethtool API" 2025-10-01 09:48:21 +02:00
devlink devlink: Refactor devlink_rate_nodes_check 2026-02-02 20:05:51 -08:00
dns_resolver net/dns_resolver: use credential guards in dns_query() 2025-11-04 12:36:51 +01:00
dsa net: dsa: tag_yt921x: add priority support 2026-02-03 15:09:31 +01:00
ethernet net: optimize eth_type_trans() vs CONFIG_STACKPROTECTOR_STRONG=y 2025-11-24 19:27:31 -08:00
ethtool ethtool: remove ETHTOOL_GRXRINGS fallback through get_rxnfc 2026-01-27 17:32:56 -08:00
handshake net/handshake: Fix null-ptr-deref in handshake_complete() 2025-12-22 12:36:40 +01:00
hsr net/hsr: fix NULL pointer dereference in prp_get_untagged_frame() 2025-12-04 11:15:13 +01:00
ieee802154 net: Convert proto callbacks from sockaddr to sockaddr_unsized 2025-11-04 19:10:33 -08:00
ife
ipv4 tcp: try to avoid safer when ACKs are thinned 2026-02-03 15:13:24 +01:00
ipv6 ipv6: colocate inet6_cork in inet_cork_full 2026-02-02 17:49:30 -08:00
iucv net: Remove KMSG_COMPONENT macro 2025-11-28 19:20:27 -08:00
kcm Networking changes for 6.19. 2025-12-03 17:24:33 -08:00
key pfkey: Deprecate pfkey 2025-10-30 09:03:12 +01:00
l2tp l2tp: avoid one data-race in l2tp_tunnel_del_work() 2026-01-19 09:55:41 -08:00
l3mdev
lapb treewide, timers: Rename from_timer() to timer_container_of() 2025-06-08 09:07:37 +02:00
llc net: Convert proto_ops connect() callbacks to use sockaddr_unsized 2025-11-04 19:10:32 -08:00
mac80211 Another fairly large set of changes, notably: 2026-01-29 19:17:43 -08:00
mac802154
mctp net: mctp: test: move TX packetqueue from dst to dev 2025-12-01 13:52:13 -08:00
mpls mpls: Drop RTNL for RTM_NEWROUTE, RTM_DELROUTE, and RTM_GETROUTE. 2025-11-03 17:40:54 -08:00
mptcp mptcp: implement .splice_read 2026-02-02 18:15:32 -08:00
ncsi net: ncsi: Fix buffer overflow in fetching version id 2025-06-12 18:21:59 -07:00
netfilter netfilter: nfnetlink_queue: optimize verdict lookup with hash table 2026-01-29 09:52:07 +01:00
netlabel audit: add record for multiple task security contexts 2025-08-30 10:15:30 -04:00
netlink net: Convert proto_ops connect() callbacks to use sockaddr_unsized 2025-11-04 19:10:32 -08:00
netrom netrom: fix double-free in nr_route_frame() 2026-01-20 19:15:40 -08:00
nfc nfc: nci: Fix race between rfkill and nci_unregister_device(). 2026-01-28 19:32:26 -08:00
nsh
openvswitch net: openvswitch: fix data race in ovs_vport_get_upcall_stats 2026-01-22 12:55:22 +01:00
packet net: Convert struct sockaddr to fixed-size "sa_data[14]" 2025-11-04 19:10:33 -08:00
phonet net: Convert proto callbacks from sockaddr to sockaddr_unsized 2025-11-04 19:10:33 -08:00
psample
psp tools: ynl-gen: add regeneration comment 2025-11-25 19:20:42 -08:00
qrtr net: Convert proto_ops connect() callbacks to use sockaddr_unsized 2025-11-04 19:10:32 -08:00
rds net/rds: rds_tcp_accept_one ought to not discard messages 2026-01-23 11:51:31 -08:00
rfkill net: replace use of system_wq with system_percpu_wq 2025-09-22 17:40:30 -07:00
rose net: rose: fix invalid array index in rose_kill_by_device() 2025-12-30 11:45:51 +01:00
rxrpc rxrpc: Fix data-race warning and potential load/store tearing 2026-01-21 19:59:29 -08:00
sched Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-01-22 20:14:36 -08:00
sctp sctp: move SCTP_CMD_ASSOC_SHKEY right after SCTP_CMD_PEER_INIT 2026-01-17 15:10:34 -08:00
shaper tools: ynl-gen: add regeneration comment 2025-11-25 19:20:42 -08:00
smc Revert "net/smc: Introduce TCP ULP support" 2026-01-30 19:21:51 -08:00
strparser Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-11-13 12:35:38 -08:00
sunrpc nfsd-6.19 fixes: 2025-12-24 09:23:04 -08:00
switchdev
tipc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-11-13 12:35:38 -08:00
tls Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-10-31 06:46:03 -07:00
unix net: do not write to msg_get_inq in callee 2026-01-08 08:45:13 -08:00
vmw_vsock vsock: add netns support to virtio transports 2026-01-27 10:45:38 +01:00
wireless Another fairly large set of changes, notably: 2026-01-29 19:17:43 -08:00
x25 net: Convert proto_ops connect() callbacks to use sockaddr_unsized 2025-11-04 19:10:32 -08:00
xdp Revert "Merge branch 'netkit-support-for-io_uring-zero-copy-and-af_xdp'" 2026-01-20 18:06:01 -08:00
xfrm xfrm: set ipv4 no_pmtu_disc flag only on output sa when direction is set 2025-12-15 11:06:25 +01:00
compat.c socket: Unify getsockname and getpeername implementation 2025-11-26 13:45:23 -07:00
devres.c
Kconfig net: Kconfig: discourage drop_monitor enablement 2025-10-17 16:29:26 -07:00
Kconfig.debug
Makefile psp: base PSP device support 2025-09-18 12:32:06 +02:00
socket.c vfs-6.19-rc1.fixes 2025-12-05 15:52:30 -08:00
sysctl_net.c