| History log of /src/sys/netinet/tcp_vtw.h |
| Revision | | Date | Author | Comments |
| 1.11 |
| 07-Oct-2024 |
jakllsch | Allow CACHE_LINE_SIZE 256 with uint64_t fatp_word_t
|
| 1.10 |
| 11-Dec-2022 |
mlelstv | branches: 1.10.8;
Need larger fat pointers for 128bit cache lines.
|
| 1.9 |
| 19-Apr-2018 |
christos | s/static inline/static __inline/g for consistency.
|
| 1.8 |
| 13-Dec-2016 |
ozaki-r | branches: 1.8.14;
Remove unnecessary inclusions of nd6.h
|
| 1.7 |
| 26-Apr-2016 |
ozaki-r | branches: 1.7.2;
Sweep unnecessary route.h inclusions
|
| 1.6 |
| 23-Nov-2012 |
joerg | branches: 1.6.2; 1.6.14;
Add RCS keyword. Avoid overflow in constant.
|
| 1.5 |
| 07-Jun-2011 |
joerg | branches: 1.5.2; 1.5.12;
Be a bit cleaner and reduce the amount of namespace pollution
|
| 1.4 |
| 06-Jun-2011 |
dyoung | Don't allocate resources for vtw until/unless it is enabled. This will
further help those machines where memory is in short supply.
TBD: release resources after vtw is disabled and all entries have
expired.
|
| 1.3 |
| 17-May-2011 |
dholland | branches: 1.3.2; 1.3.4; 1.3.6;
typo in comment
|
| 1.2 |
| 03-May-2011 |
dyoung | Remove #ifdef INET6 throughout.
|
| 1.1 |
| 03-May-2011 |
dyoung | 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.
|
| 1.3.6.2 |
| 06-Jun-2011 |
jruoho | Sync with HEAD.
|
| 1.3.6.1 |
| 17-May-2011 |
jruoho | file tcp_vtw.h was added on branch jruoho-x86intr on 2011-06-06 09:09:57 +0000
|
| 1.3.4.1 |
| 23-Jun-2011 |
cherry | Catchup with rmind-uvmplock merge.
|
| 1.3.2.3 |
| 12-Jun-2011 |
rmind | sync with head
|
| 1.3.2.2 |
| 31-May-2011 |
rmind | sync with head
|
| 1.3.2.1 |
| 17-May-2011 |
rmind | file tcp_vtw.h was added on branch rmind-uvmplock on 2011-05-31 03:05:08 +0000
|
| 1.5.12.2 |
| 03-Dec-2017 |
jdolecek | update from HEAD
|
| 1.5.12.1 |
| 25-Feb-2013 |
tls | resync with head
|
| 1.5.2.1 |
| 16-Jan-2013 |
yamt | sync with (a bit old) head
|
| 1.6.14.2 |
| 05-Feb-2017 |
skrll | Sync with HEAD
|
| 1.6.14.1 |
| 29-May-2016 |
skrll | Sync with HEAD
|
| 1.6.2.1 |
| 17-Jul-2013 |
rmind | Checkpoint work in progress:
- Move PCB structures under __INPCB_PRIVATE, adjust most of the callers
and thus make IPv4 PCB structures mostly opaque. Any volunteers for
merging in6pcb with inpcb (see rpaulo-netinet-merge-pcb branch)?
- Move various global vars to the modules where they belong, make them static.
- Some preliminary work for IPv4 PCB locking scheme.
- Make raw IP code mostly MP-safe. Simplify some of it.
- Rework "fast" IP forwarding (ipflow) code to be mostly MP-safe. It should
run from a software interrupt, rather than hard.
- Rework tun(4) pseudo interface to be MP-safe.
- Work towards making some other interfaces more strict.
|
| 1.7.2.1 |
| 07-Jan-2017 |
pgoyette | Sync with HEAD. (Note that most of these changes are simply $NetBSD$
tag issues.)
|
| 1.8.14.1 |
| 22-Apr-2018 |
pgoyette | Sync with HEAD
|
| 1.10.8.1 |
| 02-Aug-2025 |
perseant | Sync with HEAD
|
