Commit Graph

11 Commits

Author SHA1 Message Date
Gleb Smirnoff
938f0fd50f Do not mention SIOCSIFADDR. 2012-01-27 08:46:32 +00:00
Robert Watson
3cb73e3d8b Teach the loopback interface about checksum generation and validation
avoidance:

- Enable setting the RXCSUM and TXCSUM flags for loopback interfaces;
  set both by default.
- When RXCSUM is set, flag packets sent over the loopback interface as
  having checked and valid IP, UDP, TCP checksums so that higher
  protocol layers won't check them.
- Always clear CSUM_{IP,UDP_TCP} checksum required flags on transmit,
  as they will have gotten there as a result of TXCSUM being set.

This is done only for packets explicitly sent over the loopback, not
simulated loopback via if_simloop() due to !SIMPLEX interfaces, etc.

Note that enabling TXCSUM but not RXCSUM will lead to unhappiness, as
checksums won't be generated but will be validated.

Kris reports that this leads to significant performance improvements
in loopback benchmarking with TCP and UDP for throughput:

	RXCSUM 	RXCSUM+TXCSUM
TCP	15%	37%
UDP	10%	74%

Update man page.

Reviewed by:	sam
Tested by:	kris
MFC after:	1 week
2009-03-15 20:17:44 +00:00
Ruslan Ermilov
3d45e180f4 mdoc(7) police: removed HISTORY info from the .Os call. 2001-07-10 15:31:11 +00:00
Jens Schweikhardt
ec09ef4ff8 pseudo-device -> device in kernel config lines. Removed whitespace at EOL.
Reviewed by:	joerg, dd
2001-05-01 09:15:30 +00:00
Peter Wemm
7f3dea244c $Id$ -> $FreeBSD$ 1999-08-28 00:22:10 +00:00
Guy Helmer
ded07bf848 Use Cd macro for SYNOPSIS.
PR:		docs/10495
1999-05-04 20:49:12 +00:00
Peter Wemm
e25aeca937 Revert $FreeBSD$ back to $Id$ 1997-02-22 13:26:29 +00:00
Jordan K. Hubbard
1130b656e5 Make the long-awaited change from $Id$ to $FreeBSD$
This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore.  This update would have been
insane otherwise.
1997-01-14 07:20:47 +00:00
Wolfram Schneider
0b992c1d66 Sort cross references. 1996-12-26 16:16:37 +00:00
Mike Pritchard
e40f3f85d4 Do not install the now unsupported netns and netiso
related man pages.  Comment out cross references to those man
pages from other man pages.
1996-04-08 05:15:09 +00:00
Rodney W. Grimes
afe61c1516 BSD 4.4 Lite Share Sources 1994-05-30 19:09:18 +00:00