6d172f58a2
received on a TCP session that has entered the ESTABLISHED state. This results in a lot of calls to reset the keepalive timer. This patch changes the behavior so we set the keepalive timer for the keepalive idle time (TP_KEEPIDLE). When the keepalive timer fires, it will first check to see if the session has been idle for TP_KEEPIDLE ticks. If not, it will reschedule the keepalive timer for the time the session will have been idle for TP_KEEPIDLE ticks. For a session with regular communication, the keepalive timer should fire approximately once every TP_KEEPIDLE ticks. For sessions with irregular communication, the keepalive timer might fire more often. But, the disruption from a periodic keepalive timer should be less than the regular cost of resetting the keepalive timer on every packet. (FWIW, this change saved approximately 1.73% of the busy CPU cycles on a particular test system with a heavy TCP output load. Of course, the actual impact is very specific to the particular hardware and workload.) Reviewed by: gallatin, rrs MFC after: 2 weeks Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D8243 |
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|---|---|---|
| .. | ||
| cc | ||
| khelp | ||
| libalias | ||
| tcp_stacks | ||
| accf_data.c | ||
| accf_dns.c | ||
| accf_http.c | ||
| icmp6.h | ||
| icmp_var.h | ||
| if_atm.c | ||
| if_atm.h | ||
| if_ether.c | ||
| if_ether.h | ||
| igmp_var.h | ||
| igmp.c | ||
| igmp.h | ||
| in_cksum.c | ||
| in_debug.c | ||
| in_fib.c | ||
| in_fib.h | ||
| in_gif.c | ||
| in_jail.c | ||
| in_kdtrace.c | ||
| in_kdtrace.h | ||
| in_mcast.c | ||
| in_pcb.c | ||
| in_pcb.h | ||
| in_pcbgroup.c | ||
| in_prot.c | ||
| in_proto.c | ||
| in_rmx.c | ||
| in_rss.c | ||
| in_rss.h | ||
| in_systm.h | ||
| in_var.h | ||
| in.c | ||
| in.h | ||
| ip6.h | ||
| ip_carp.c | ||
| ip_carp.h | ||
| ip_divert.c | ||
| ip_divert.h | ||
| ip_dummynet.h | ||
| ip_ecn.c | ||
| ip_ecn.h | ||
| ip_encap.c | ||
| ip_encap.h | ||
| ip_fastfwd.c | ||
| ip_fw.h | ||
| ip_gre.c | ||
| ip_icmp.c | ||
| ip_icmp.h | ||
| ip_id.c | ||
| ip_input.c | ||
| ip_ipsec.c | ||
| ip_ipsec.h | ||
| ip_mroute.c | ||
| ip_mroute.h | ||
| ip_options.c | ||
| ip_options.h | ||
| ip_output.c | ||
| ip_reass.c | ||
| ip_var.h | ||
| ip.h | ||
| pim_var.h | ||
| pim.h | ||
| raw_ip.c | ||
| sctp_asconf.c | ||
| sctp_asconf.h | ||
| sctp_auth.c | ||
| sctp_auth.h | ||
| sctp_bsd_addr.c | ||
| sctp_bsd_addr.h | ||
| sctp_cc_functions.c | ||
| sctp_constants.h | ||
| sctp_crc32.c | ||
| sctp_crc32.h | ||
| sctp_dtrace_declare.h | ||
| sctp_dtrace_define.h | ||
| sctp_header.h | ||
| sctp_indata.c | ||
| sctp_indata.h | ||
| sctp_input.c | ||
| sctp_input.h | ||
| sctp_lock_bsd.h | ||
| sctp_os_bsd.h | ||
| sctp_os.h | ||
| sctp_output.c | ||
| sctp_output.h | ||
| sctp_pcb.c | ||
| sctp_pcb.h | ||
| sctp_peeloff.c | ||
| sctp_peeloff.h | ||
| sctp_ss_functions.c | ||
| sctp_structs.h | ||
| sctp_syscalls.c | ||
| sctp_sysctl.c | ||
| sctp_sysctl.h | ||
| sctp_timer.c | ||
| sctp_timer.h | ||
| sctp_uio.h | ||
| sctp_usrreq.c | ||
| sctp_var.h | ||
| sctp.h | ||
| sctputil.c | ||
| sctputil.h | ||
| siftr.c | ||
| tcp_debug.c | ||
| tcp_debug.h | ||
| tcp_fastopen.c | ||
| tcp_fastopen.h | ||
| tcp_fsm.h | ||
| tcp_hostcache.c | ||
| tcp_hostcache.h | ||
| tcp_input.c | ||
| tcp_lro.c | ||
| tcp_lro.h | ||
| tcp_offload.c | ||
| tcp_offload.h | ||
| tcp_output.c | ||
| tcp_pcap.c | ||
| tcp_pcap.h | ||
| tcp_reass.c | ||
| tcp_sack.c | ||
| tcp_seq.h | ||
| tcp_subr.c | ||
| tcp_syncache.c | ||
| tcp_syncache.h | ||
| tcp_timer.c | ||
| tcp_timer.h | ||
| tcp_timewait.c | ||
| tcp_usrreq.c | ||
| tcp_var.h | ||
| tcp.h | ||
| tcpip.h | ||
| toecore.c | ||
| toecore.h | ||
| udp_usrreq.c | ||
| udp_var.h | ||
| udp.h | ||
| udplite.h | ||