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9cd5ef0b8c
linux/net/ipv4
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Eric Dumazet 9cd5ef0b8c net: rfs: add sock_rps_delete_flow() helper 
RFS can exhibit lower performance for workloads using short-lived
flows and a small set of 4-tuple.

This is often the case for load-testers, using a pair of hosts,
if the server has a single listener port.

Typical use case :

Server : tcp_crr -T128 -F1000 -6 -U -l30 -R 14250
Client : tcp_crr -T128 -F1000 -6 -U -l30 -c -H server | grep local_throughput

This is because RFS global hash table contains stale information,
when the same RSS key is recycled for another socket and another cpu.

Make sure to undo the changes and go back to initial state when
a flow is disconnected.

Performance of the above test is increased by 22 %,
going from 372604 transactions per second to 457773.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Octavian Purdila <tavip@google.com>
Reviewed-by: Neal Cardwell <ncardwell@google.com>
Link: https://patch.msgid.link/20250515100354.3339920-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2025-05-16 16:03:48 -07:00
..
netfilter netfilter: fib: avoid lookup if socket is available 2025-03-21 10:12:15 +01:00
af_inet.c net: Retire DCCP socket. 2025-04-11 18:58:10 -07:00
ah4.c net: fill in MODULE_DESCRIPTION()s for ipv4 modules 2024-02-09 14:12:02 -08:00
arp.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-02-20 10:37:30 -08:00
bpf_tcp_ca.c tcp: Pass flags to __tcp_send_ack 2025-03-17 13:56:38 +00:00
cipso_ipv4.c move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
datagram.c ipv4: Use inet_sk_init_flowi4() in ip4_datagram_release_cb(). 2024-12-20 13:50:09 -08:00
devinet.c ipv4: Use nlmsg_payload in devinet file 2025-04-16 18:33:02 -07:00
esp4_offload.c xfrm: Add an inbound percpu state cache. 2024-10-29 11:56:18 +01:00
esp4.c ipsec-2025-01-27 2025-01-27 15:15:12 -08:00
fib_frontend.c ipv4: Use nlmsg_payload in fib_frontend file 2025-04-16 18:33:02 -07:00
fib_lookup.h
fib_notifier.c net: do not acquire rtnl in fib_seq_sum() 2024-10-11 15:35:05 -07:00
fib_rules.c ipv4: fib_rules: Add DSCP mask matching 2025-02-21 16:08:47 -08:00
fib_semantics.c ipv4: Honor "ignore_routes_with_linkdown" sysctl in nexthop selection 2025-05-03 21:52:38 +01:00
fib_trie.c ipv4: fib: Move fib_valid_key_len() to rtm_to_fib_config(). 2025-03-03 15:04:11 -08:00
fou_bpf.c ip_tunnel: convert __be16 tunnel flags to bitmaps 2024-04-01 10:49:28 +01:00
fou_core.c fou: fix initialization of grc 2024-09-09 17:21:47 -07:00
fou_nl.c tools: ynl-gen: use big-endian netlink attribute types 2024-10-22 15:33:24 +02:00
fou_nl.h net: ynl: prefix uAPI header include with uapi/ 2023-05-26 10:30:14 +01:00
gre_demux.c net: ip_gre: Fix spelling mistake "demultiplexor" -> "demultiplexer" 2025-04-24 18:20:40 -07:00
gre_offload.c net: gro: rename skb_gro_header_hard() 2024-03-05 13:30:11 +01:00
icmp.c inet: ping: avoid skb_clone() dance in ping_rcv() 2025-02-28 14:41:33 -08:00
igmp_internal.h netlink: support dumping IPv4 multicast addresses 2025-02-11 11:26:53 +01:00
igmp.c treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
inet_connection_sock.c tcp: Rename tcp_or_dccp_get_hashinfo(). 2025-04-11 18:58:11 -07:00
inet_diag.c net: cgroup: Guard users of sock_cgroup_classid() 2025-04-24 16:04:02 +02:00
inet_fragment.c treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
inet_hashtables.c net: rfs: add sock_rps_delete_flow() helper 2025-05-16 16:03:48 -07:00
inet_timewait_sock.c net: Unexport shared functions for DCCP. 2025-04-11 18:58:11 -07:00
inetpeer.c inetpeer: use EXPORT_IPV6_MOD[_GPL]() 2025-02-14 13:09:39 -08:00
ip_forward.c net: fix IPSTATS_MIB_OUTFORWDATAGRAMS increment after fragment check 2023-10-13 09:58:45 -07:00
ip_fragment.c inet: frags: save a pair of atomic operations in reassembly 2025-03-18 13:18:36 +01:00
ip_gre.c ipv4: ip_tunnel: Convert ip_tunnel_delete_nets() callers to ->exit_rtnl(). 2025-04-14 17:08:42 -07:00
ip_input.c ipv4: remove useless arg 2025-01-02 17:17:40 -08:00
ip_options.c net: ip: make ip_route_input() return drop reasons 2024-11-12 11:24:51 +01:00
ip_output.c net: devmem: Implement TX path 2025-05-13 11:12:48 +02:00
ip_sockglue.c Networking changes for 6.14. 2025-01-22 08:28:57 -08:00
ip_tunnel_core.c net: fix geneve_opt length integer overflow 2025-04-03 15:47:35 -07:00
ip_tunnel.c ipv4: ip_tunnel: Replace strcpy use with strscpy 2025-05-05 18:16:11 -07:00
ip_vti.c ipv4: ip_tunnel: Convert ip_tunnel_delete_nets() callers to ->exit_rtnl(). 2025-04-14 17:08:42 -07:00
ipcomp.c xfrm: ipcomp: add extack to ipcomp{4,6}_init_state 2022-09-29 07:18:00 +02:00
ipconfig.c net: ipconfig: move ic_nameservers_fallback into #ifdef block 2023-05-22 11:17:55 +01:00
ipip.c ipv4: ip_tunnel: Convert ip_tunnel_delete_nets() callers to ->exit_rtnl(). 2025-04-14 17:08:42 -07:00
ipmr_base.c ipmr: do not call mr_mfc_uses_dev() for unres entries 2025-01-23 07:08:13 -08:00
ipmr.c ipv4: Use nlmsg_payload in ipmr file 2025-04-16 18:33:03 -07:00
Kconfig net: Retire DCCP socket. 2025-04-11 18:58:10 -07:00
Makefile bpfilter: remove bpfilter 2024-01-04 10:23:10 -08:00
metrics.c net: remove NULL-pointer net parameter in ip_metrics_convert 2024-06-05 10:06:00 +01:00
netfilter.c netfilter: ipv4: Convert ip_route_me_harder() to dscp_t. 2024-11-15 11:00:29 +01:00
netlink.c
nexthop.c ipv6: Get rid of RTNL for SIOCADDRT and RTM_NEWROUTE. 2025-04-24 09:29:56 +02:00
ping.c inet: ping: avoid skb_clone() dance in ping_rcv() 2025-02-28 14:41:33 -08:00
proc.c tcp: add LINUX_MIB_PAWS_TW_REJECTED counter 2025-04-10 18:29:26 -07:00
protocol.c
raw_diag.c inet_diag: add module pointer to "struct inet_diag_handler" 2024-01-23 15:13:54 +01:00
raw.c ipv4: remove get_rttos 2025-02-18 18:27:19 -08:00
route.c ipv4/route: Use this_cpu_inc() for stats on PREEMPT_RT 2025-05-15 15:23:30 +02:00
syncookies.c tcp: be less liberal in TSEcr received while in SYN_RECV state 2025-02-26 18:11:17 -08:00
sysctl_net_ipv4.c tcp: add tcp_rto_max_ms sysctl 2025-02-11 13:08:00 +01:00
tcp_ao.c net/tcp: Add missing lockdep annotations for TCP-AO hlist traversals 2024-11-03 12:10:11 -08:00
tcp_bbr.c tcp: Add new args for cong_control in tcp_congestion_ops 2024-05-02 16:26:56 -07:00
tcp_bic.c
tcp_bpf.c bpf: Fix wrong copied_seq calculation 2025-01-29 13:32:23 -08:00
tcp_cdg.c Random number generator fixes for Linux 6.1-rc1. 2022-10-16 15:27:07 -07:00
tcp_cong.c tcp: only release congestion control if it has been initialized 2024-10-31 18:22:48 -07:00
tcp_cubic.c tcp_cubic: fix incorrect HyStart round start detection 2025-01-20 12:26:41 +00:00
tcp_dctcp.c tcp: helpers for ECN mode handling 2025-03-17 13:54:11 +00:00
tcp_dctcp.h tcp: Pass flags to __tcp_send_ack 2025-03-17 13:56:38 +00:00
tcp_diag.c tcp: ulp: diag: more info without CAP_NET_ADMIN 2025-03-07 19:39:53 -08:00
tcp_fastopen.c tcp: fastopen: note that a child socket was created 2025-04-24 18:21:04 -07:00
tcp_highspeed.c
tcp_htcp.c tcp: Use clamp() in htcp_alpha_update() 2024-08-06 12:16:25 -07:00
tcp_hybla.c
tcp_illinois.c
tcp_input.c tcp: skip big rtt sample if receive queue is not empty 2025-05-15 11:30:09 -07:00
tcp_ipv4.c tcp: increase tcp_limit_output_bytes default value to 4MB 2025-05-15 11:30:09 -07:00
tcp_lp.c tcp: rename tcp_time_stamp() to tcp_time_stamp_ts() 2023-10-23 09:35:01 +01:00
tcp_metrics.c tcp: convert to dev_net_rcu() 2025-03-03 15:44:19 -08:00
tcp_minisocks.c tcp: add LINUX_MIB_PAWS_TW_REJECTED counter 2025-04-10 18:29:26 -07:00
tcp_nv.c
tcp_offload.c net: use sock_gen_put() when sk_state is TCP_TIME_WAIT 2025-05-01 07:00:19 -07:00
tcp_output.c tcp: always use tcp_limit_output_bytes limitation 2025-05-15 11:30:09 -07:00
tcp_plb.c prandom: remove prandom_u32_max() 2022-12-20 03:13:45 +01:00
tcp_rate.c
tcp_recovery.c tcp: fix excessive TLP and RACK timeouts from HZ rounding 2023-10-17 17:25:42 -07:00
tcp_scalable.c
tcp_sigpool.c net/tcp_sigpool: Use nested-BH locking for sigpool_scratch. 2024-06-24 16:41:22 -07:00
tcp_timer.c Networking changes for 6.15. 2025-03-26 21:48:21 -07:00
tcp_ulp.c net/ulp: use consistent error code when blocking ULP 2023-01-19 09:26:16 -08:00
tcp_vegas.c
tcp_vegas.h
tcp_veno.c
tcp_westwood.c
tcp_yeah.c
tcp.c tcp: increase tcp_rmem[2] to 32 MB 2025-05-15 11:30:09 -07:00
tunnel4.c net: fill in MODULE_DESCRIPTION()s for ipv4 modules 2024-02-09 14:12:02 -08:00
udp_bpf.c bpf, sockmap: Fix an infinite loop error when len is 0 in tcp_bpf_recvmsg_parser() 2023-03-03 17:25:15 +01:00
udp_diag.c inet_diag: add module pointer to "struct inet_diag_handler" 2024-01-23 15:13:54 +01:00
udp_impl.h sock: Remove ->sendpage*() in favour of sendmsg(MSG_SPLICE_PAGES) 2023-06-24 15:50:13 -07:00
udp_offload.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-05-01 15:11:38 -07:00
udp_tunnel_core.c udp: properly deal with xfrm encap and ADDRFORM 2025-04-14 14:29:01 -07:00
udp_tunnel_nic.c udp_tunnel: Use flex array to simplify code 2023-10-03 11:39:34 +02:00
udp_tunnel_stub.c
udp.c net: rfs: add sock_rps_delete_flow() helper 2025-05-16 16:03:48 -07:00
udplite.c udplite: remove UDPLITE_BIT 2023-09-14 16:16:36 +02:00
xfrm4_input.c ipv4: Convert ip_route_input_noref() to dscp_t. 2024-10-03 16:21:21 -07:00
xfrm4_output.c
xfrm4_policy.c xfrm: Convert struct xfrm_dst_lookup_params -> tos to dscp_t. 2024-11-06 12:42:51 +01:00
xfrm4_protocol.c ipv4: Convert ip_route_input_noref() to dscp_t. 2024-10-03 16:21:21 -07:00
xfrm4_state.c
xfrm4_tunnel.c net: fill in MODULE_DESCRIPTION()s for ipv4 modules 2024-02-09 14:12:02 -08:00