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author | dg <dg@FreeBSD.org> | 1998-01-27 09:15:13 +0000 |
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committer | dg <dg@FreeBSD.org> | 1998-01-27 09:15:13 +0000 |
commit | 7262ff6e58b1d30213c744786d6687611d4695c7 (patch) | |
tree | ec76082ebe6779d7a4cff2c107e7727a3e838a26 /share/syscons/keymaps/danish.cp865.kbd | |
parent | 7a6d3914c386d52c97a9c61f28c4e28f617860d4 (diff) | |
download | FreeBSD-src-7262ff6e58b1d30213c744786d6687611d4695c7.zip FreeBSD-src-7262ff6e58b1d30213c744786d6687611d4695c7.tar.gz |
Improved connection establishment performance by doing local port lookups via
a hashed port list. In the new scheme, in_pcblookup() goes away and is
replaced by a new routine, in_pcblookup_local() for doing the local port
check. Note that this implementation is space inefficient in that the PCB
struct is now too large to fit into 128 bytes. I might deal with this in the
future by using the new zone allocator, but I wanted these changes to be
extensively tested in their current form first.
Also:
1) Fixed off-by-one errors in the port lookup loops in in_pcbbind().
2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash()
to do the initialial hash insertion.
3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability.
4) Added a new routine, in_pcbremlists() to remove the PCB from the various
hash lists.
5) Added/deleted comments where appropriate.
6) Removed unnecessary splnet() locking. In general, the PCB functions should
be called at splnet()...there are unfortunately a few exceptions, however.
7) Reorganized a few structs for better cache line behavior.
8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in
the future, however.
These changes have been tested on wcarchive for more than a month. In tests
done here, connection establishment overhead is reduced by more than 50
times, thus getting rid of one of the major networking scalability problems.
Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a
large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult.
WARNING: Anything that knows about inpcb and tcpcb structs will have to be
recompiled; at the very least, this includes netstat(1).
Diffstat (limited to 'share/syscons/keymaps/danish.cp865.kbd')
0 files changed, 0 insertions, 0 deletions