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Haiyang Zhang 562b1fdf06 tcp: Set pingpong threshold via sysctl 
TCP pingpong threshold is 1 by default. But some applications, like SQL DB
may prefer a higher pingpong threshold to activate delayed acks in quick
ack mode for better performance.

The pingpong threshold and related code were changed to 3 in the year
2019 in:
  commit 4a41f453be ("tcp: change pingpong threshold to 3")
And reverted to 1 in the year 2022 in:
  commit 4d8f24eeed ("Revert "tcp: change pingpong threshold to 3"")

There is no single value that fits all applications.
Add net.ipv4.tcp_pingpong_thresh sysctl tunable, so it can be tuned for
optimal performance based on the application needs.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://lore.kernel.org/r/1697056244-21888-1-git-send-email-haiyangz@microsoft.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
 		2023-10-16 14:55:32 -07:00
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6lowpan
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9p
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802
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8021q
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appletalk appletalk: remove special handling code for ipddp 2023-10-13 17:59:32 -07:00
atm
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ax25 net: implement lockless SO_PRIORITY 2023-10-01 19:09:54 +01:00
batman-adv Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-08-24 10:51:39 -07:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-10-05 13:16:47 -07:00
bpf bpf: Prevent inlining of bpf_fentry_test7() 2023-08-30 08:36:17 +02:00
bpfilter
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bridge net: Handle bulk delete policy in bridge driver 2023-10-13 10:00:30 +01:00
caif
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can Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-10-12 17:07:34 -07:00
ceph ceph: Annotate struct ceph_monmap with __counted_by 2023-09-18 10:39:29 +01:00
core net, sched: Make tc-related drop reason more flexible 2023-10-16 10:07:36 -07:00
dcb
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dccp tcp: record last received ipv6 flowlabel 2023-10-10 10:02:59 +02:00
devlink Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-10-12 17:07:34 -07:00
dns_resolver
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dsa net: dsa: remove dsa_port_phylink_validate() 2023-10-11 10:06:05 +01:00
ethernet
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ethtool ethtool: Fix mod state of verbose no_mask bitset 2023-10-10 19:48:15 -07:00
handshake handshake: Fix sign of key_serial_t fields 2023-10-02 12:34:21 -07:00
hsr net: hsr: Add __packed to struct hsr_sup_tlv. 2023-09-18 08:26:19 +01:00
ieee802154 sysctl-6.6-rc1 2023-08-29 17:39:15 -07:00
ife
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ipv4 tcp: Set pingpong threshold via sysctl 2023-10-16 14:55:32 -07:00
ipv6 net: fix IPSTATS_MIB_OUTFORWDATAGRAMS increment after fragment check 2023-10-13 09:58:45 -07:00
iucv
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kcm kcm: Fix error handling for SOCK_DGRAM in kcm_sendmsg(). 2023-09-14 10:43:51 +02:00
key
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l2tp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-10-05 13:16:47 -07:00
l3mdev
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lapb
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llc
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mac80211 Merge wireless into wireless-next 2023-10-06 17:08:47 +03:00
mac802154
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mctp mctp: perform route lookups under a RCU read-side lock 2023-10-10 19:43:22 -07:00
mpls
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mptcp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-10-05 13:16:47 -07:00
ncsi ncsi: Propagate carrier gain/loss events to the NCSI controller 2023-09-18 07:06:05 +01:00
netfilter netfilter: conntrack: prefer tcp_error_log to pr_debug 2023-10-10 16:34:28 +02:00
netlabel
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netlink netlink: Annotate struct netlink_policy_dump_state with __counted_by 2023-10-06 10:48:46 +01:00
netrom net: implement lockless SO_PRIORITY 2023-10-01 19:09:54 +01:00
nfc nfc: nci: assert requested protocol is valid 2023-10-12 09:32:10 +02:00
nsh
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openvswitch net: openvswitch: Annotate struct dp_meter with __counted_by 2023-10-02 11:24:55 -07:00
packet Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-10-12 17:07:34 -07:00
phonet
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psample
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qrtr
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rds net: prevent address rewrite in kernel_bind() 2023-10-01 19:31:29 +01:00
rfkill rfkill: sync before userspace visibility/changes 2023-09-18 09:36:57 +02:00
rose net: implement lockless SO_PRIORITY 2023-10-01 19:09:54 +01:00
rxrpc
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sched net, sched: Add tcf_set_drop_reason for {__,}tcf_classify 2023-10-16 10:07:37 -07:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-10-05 13:16:47 -07:00
smc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-10-12 17:07:34 -07:00
strparser
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sunrpc SUNRPC/TLS: Lock the lower_xprt during the tls handshake 2023-09-27 15:16:40 -04:00
switchdev
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tipc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-10-05 13:16:47 -07:00
tls tls: use fixed size for tls_offload_context_{tx,rx}.driver_state 2023-10-13 11:26:10 +01:00
unix Including fixes from netfilter and bpf. 2023-09-07 18:33:07 -07:00
vmw_vsock vsock: enable setting SO_ZEROCOPY 2023-10-15 13:19:42 +01:00
wireless Merge wireless into wireless-next 2023-10-06 17:08:47 +03:00
x25 net: implement lockless SO_PRIORITY 2023-10-01 19:09:54 +01:00
xdp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-10-12 17:07:34 -07:00
xfrm net: dst: remove unnecessary input parameter in dst_alloc and dst_init 2023-09-12 11:42:25 +02:00
Kconfig net: add skb_segment kunit test 2023-10-11 10:39:01 +01:00
Kconfig.debug
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Makefile
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compat.c
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devres.c
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socket.c net: prevent address rewrite in kernel_bind() 2023-10-01 19:31:29 +01:00
sysctl_net.c
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