NetBSD/sys/netinet/files.netinet

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# $NetBSD: files.netinet,v 1.24 2012/06/25 15:28:39 christos Exp $
defflag opt_tcp_debug.h TCP_DEBUG
defparam opt_tcp_debug.h TCP_NDEBUG
defflag opt_inet.h INET INET6 TCP_SIGNATURE
TCP_OUTPUT_COUNTERS TCP_REASS_COUNTERS IPSELSRC
defparam opt_inet_conf.h SUBNETSARELOCAL HOSTZEROBROADCAST
defflag MROUTING
defflag PIM
defflag TCP_COMPAT_42
defparam opt_tcp_space.h TCP_RECVSPACE TCP_SENDSPACE
defflag opt_inet_csum.h INET_CSUM_COUNTERS TCP_CSUM_COUNTERS
UDP_CSUM_COUNTERS
defparam opt_tcp_congctl.h TCP_CONGCTL_DEFAULT
file netinet/igmp.c inet
file netinet/in.c inet
file netinet/in_offload.c inet
file netinet/in_pcb.c inet
file netinet/in_proto.c inet
file netinet/in_selsrc.c inet & ipselsrc
file netinet/ip_flow.c inet & gateway
file netinet/ip_icmp.c inet
2003-11-27 00:26:56 +03:00
file netinet/ip_id.c inet
file netinet/ip_input.c inet
file netinet/ip_mroute.c inet & mrouting
file netinet/ip_output.c inet
file netinet/ip_reass.c inet
file netinet/raw_ip.c inet
file netinet/tcp_debug.c (inet | inet6) & tcp_debug
file netinet/tcp_input.c inet | inet6
file netinet/tcp_output.c inet | inet6
file netinet/tcp_sack.c inet | inet6
file netinet/tcp_subr.c inet | inet6
file netinet/tcp_timer.c inet | inet6
file netinet/tcp_usrreq.c inet | inet6
file netinet/tcp_congctl.c inet | inet6
Reduces the resources demanded by TCP sessions in TIME_WAIT-state using methods called Vestigial Time-Wait (VTW) and Maximum Segment Lifetime Truncation (MSLT). MSLT and VTW were contributed by Coyote Point Systems, Inc. Even after a TCP session enters the TIME_WAIT state, its corresponding socket and protocol control blocks (PCBs) stick around until the TCP Maximum Segment Lifetime (MSL) expires. On a host whose workload necessarily creates and closes down many TCP sockets, the sockets & PCBs for TCP sessions in TIME_WAIT state amount to many megabytes of dead weight in RAM. Maximum Segment Lifetimes Truncation (MSLT) assigns each TCP session to a class based on the nearness of the peer. Corresponding to each class is an MSL, and a session uses the MSL of its class. The classes are loopback (local host equals remote host), local (local host and remote host are on the same link/subnet), and remote (local host and remote host communicate via one or more gateways). Classes corresponding to nearer peers have lower MSLs by default: 2 seconds for loopback, 10 seconds for local, 60 seconds for remote. Loopback and local sessions expire more quickly when MSLT is used. Vestigial Time-Wait (VTW) replaces a TIME_WAIT session's PCB/socket dead weight with a compact representation of the session, called a "vestigial PCB". VTW data structures are designed to be very fast and memory-efficient: for fast insertion and lookup of vestigial PCBs, the PCBs are stored in a hash table that is designed to minimize the number of cacheline visits per lookup/insertion. The memory both for vestigial PCBs and for elements of the PCB hashtable come from fixed-size pools, and linked data structures exploit this to conserve memory by representing references with a narrow index/offset from the start of a pool instead of a pointer. When space for new vestigial PCBs runs out, VTW makes room by discarding old vestigial PCBs, oldest first. VTW cooperates with MSLT. It may help to think of VTW as a "FIN cache" by analogy to the SYN cache. A 2.8-GHz Pentium 4 running a test workload that creates TIME_WAIT sessions as fast as it can is approximately 17% idle when VTW is active versus 0% idle when VTW is inactive. It has 103 megabytes more free RAM when VTW is active (approximately 64k vestigial PCBs are created) than when it is inactive.
2011-05-03 22:28:44 +04:00
file netinet/tcp_vtw.c inet | inet6
file netinet/udp_usrreq.c inet | inet6
file netinet/portalgo.c inet | inet6