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Aananth V 718c49f840 tcp: new TCP_INFO stats for RTO events ... [ Upstream commit 3868ab0f19 ] The 2023 SIGCOMM paper "Improving Network Availability with Protective ReRoute" has indicated Linux TCP's RTO-triggered txhash rehashing can effectively reduce application disruption during outages. To better measure the efficacy of this feature, this patch adds three more detailed stats during RTO recovery and exports via TCP_INFO. Applications and monitoring systems can leverage this data to measure the network path diversity and end-to-end repair latency during network outages to improve their network infrastructure. The following counters are added to tcp_sock in order to track RTO events over the lifetime of a TCP socket. 1. u16 total_rto - Counts the total number of RTO timeouts. 2. u16 total_rto_recoveries - Counts the total number of RTO recoveries. 3. u32 total_rto_time - Counts the total time spent (ms) in RTO recoveries. (time spent in CA_Loss and CA_Recovery states) To compute total_rto_time, we add a new u32 rto_stamp field to tcp_sock. rto_stamp records the start timestamp (ms) of the last RTO recovery (CA_Loss). Corresponding fields are also added to the tcp_info struct. Signed-off-by: Aananth V <aananthv@google.com> Signed-off-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: Yuchung Cheng <ycheng@google.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Stable-dep-of: 27c80efcc2 ("tcp: fix TFO SYN_RECV to not zero retrans_stamp with retransmits out") Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2024-10-17 15:24:23 +02:00
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asm-generic	syscalls: fix compat_sys_io_pgetevents_time64 usage	2024-07-05 09:34:04 +02:00
drm	drm/amdgpu: handle gfx12 in amdgpu_display_verify_sizes	2024-09-12 11:11:43 +02:00
linux	tcp: new TCP_INFO stats for RTO events	2024-10-17 15:24:23 +02:00
misc	Revert "misc: fastrpc: Restrict untrusted app to attach to privileged PD"	2024-08-29 17:33:10 +02:00
mtd	This pull request contains updates for UBI and UBIFS	2022-10-14 18:23:23 -07:00
rdma	RDMA/bnxt_re: Adds MSN table capability for Gen P7 adapters	2024-06-12 11:12:10 +02:00
scsi	scsi: mpi3mr: Avoid memcpy field-spanning write WARNING	2024-05-17 12:02:11 +02:00
sound	ASoC: SOF: topology: Add a token for dropping widget name in kcontrol name	2023-08-15 13:25:56 +01:00
video	License cleanup: add SPDX license identifier to uapi header files with a license	2017-11-02 11:20:11 +01:00
xen	xen: irqfd: Use _IOW instead of the internal _IOC() macro	2023-11-20 11:59:12 +01:00
Kbuild	kbuild: re-implement Makefile.headersinst without recursion	2019-06-15 19:57:02 +09:00