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301772 |
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09-Jun-2016 |
truckman |
MFC r300779, r300781, r300783, r300784, r300949, r301162, r301180
r300779 | truckman | 2016-05-26 14:40:13 -0700 (Thu, 26 May 2016) | 64 lines
Import Dummynet AQM version 0.2.1 (CoDel, FQ-CoDel, PIE and FQ-PIE).
Centre for Advanced Internet Architectures
Implementing AQM in FreeBSD
* Overview <http://caia.swin.edu.au/freebsd/aqm/index.html>
* Articles, Papers and Presentations <http://caia.swin.edu.au/freebsd/aqm/papers.html>
* Patches and Tools <http://caia.swin.edu.au/freebsd/aqm/downloads.html>
Overview
Recent years have seen a resurgence of interest in better managing the depth of bottleneck queues in routers, switches and other places that get congested. Solutions include transport protocol enhancements at the end-hosts (such as delay-based or hybrid congestion control schemes) and active queue management (AQM) schemes applied within bottleneck queues.
The notion of AQM has been around since at least the late 1990s (e.g. RFC 2309). In recent years the proliferation of oversized buffers in all sorts of network devices (aka bufferbloat) has stimulated keen community interest in four new AQM schemes -- CoDel, FQ-CoDel, PIE and FQ-PIE.
The IETF AQM working group is looking to document these schemes, and independent implementations are a corner-stone of the IETF's process for confirming the clarity of publicly available protocol descriptions. While significant development work on all three schemes has occured in the Linux kernel, there is very little in FreeBSD.
Project Goals
This project began in late 2015, and aims to design and implement functionally-correct versions of CoDel, FQ-CoDel, PIE and FQ_PIE in FreeBSD (with code BSD-licensed as much as practical). We have chosen to do this as extensions to FreeBSD's ipfw/dummynet firewall and traffic shaper. Implementation of these AQM schemes in FreeBSD will: * Demonstrate whether the publicly available documentation is sufficient to enable independent, functionally equivalent implementations
* Provide a broader suite of AQM options for sections the networking community that rely on FreeBSD platforms
Program Members:
* Rasool Al Saadi (developer)
* Grenville Armitage (project lead)
Acknowledgements:
This project has been made possible in part by a gift from the Comcast Innovation Fund.
Submitted by: Rasool Al-Saadi <ralsaadi@swin.edu.au> X-No objection: core MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D6388
[Remove some code that was added to the mq_append() inline function in HEAD by r258457, which was not merged to stable/10. The AQM patch moved mq_append() from ip_dn_io.c to the new file ip_dn_private.h, so we need to remove that copy of the r258457 changes.] ------------------------------------------------------------------------ r300781 | truckman | 2016-05-26 14:44:52 -0700 (Thu, 26 May 2016) | 7 lines
Modify BOUND_VAR() macro to wrap all of its arguments in () and tweak its expression to work on powerpc and sparc64 (gcc compatibility).
Correct a typo in a nearby comment.
MFC after: 2 weeks (with r300779)
------------------------------------------------------------------------ r300783 | truckman | 2016-05-26 15:03:28 -0700 (Thu, 26 May 2016) | 4 lines
Correct a typo in a comment.
MFC after: 2 weeks (with r300779)
------------------------------------------------------------------------ r300784 | truckman | 2016-05-26 15:07:09 -0700 (Thu, 26 May 2016) | 5 lines
Include the new AQM files when compiling a kernel with options DUMMYNET.
Reported by: Nikolay Denev <nike_d AT cytexbg DOT com> MFC after: 2 weeks (with r300779)
------------------------------------------------------------------------ r300949 | truckman | 2016-05-29 00:23:56 -0700 (Sun, 29 May 2016) | 10 lines
Cast some expressions that multiply a long long constant by a floating point constant to int64_t. This avoids the runtime conversion of the the other operand in a set of comparisons from int64_t to floating point and doing the comparisions in floating point.
Suggested by: lidl Submitted by: Rasool Al-Saadi <ralsaadi@swin.edu.au> MFC after: 2 weeks (with r300779)
------------------------------------------------------------------------ r301162 | truckman | 2016-06-01 13:04:24 -0700 (Wed, 01 Jun 2016) | 9 lines
Replace constant expressions that contain multiplications by fractional floating point values with integer divides. This will eliminate any chance that the compiler will generate code to evaluate the expression using floating point at runtime.
Suggested by: bde Submitted by: Rasool Al-Saadi <ralsaadi@swin.edu.au> MFC after: 8 days (with r300779 and r300949)
------------------------------------------------------------------------ r301180 | truckman | 2016-06-01 17:42:15 -0700 (Wed, 01 Jun 2016) | 2 lines
Belatedly bump .Dd date for Dummynet AQM import in r300779.
Relnotes: yes
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240494 |
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14-Sep-2012 |
glebius |
o Create directory sys/netpfil, where all packet filters should reside, and move there ipfw(4) and pf(4).
o Move most modified parts of pf out of contrib.
Actual movements:
sys/contrib/pf/net/*.c -> sys/netpfil/pf/ sys/contrib/pf/net/*.h -> sys/net/ contrib/pf/pfctl/*.c -> sbin/pfctl contrib/pf/pfctl/*.h -> sbin/pfctl contrib/pf/pfctl/pfctl.8 -> sbin/pfctl contrib/pf/pfctl/*.4 -> share/man/man4 contrib/pf/pfctl/*.5 -> share/man/man5
sys/netinet/ipfw -> sys/netpfil/ipfw
The arguable movement is pf/net/*.h -> sys/net. There are future plans to refactor pf includes, so I decided not to break things twice.
Not modified bits of pf left in contrib: authpf, ftp-proxy, tftp-proxy, pflogd.
The ipfw(4) movement is planned to be merged to stable/9, to make head and stable match.
Discussed with: bz, luigi
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204591 |
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02-Mar-2010 |
luigi |
Bring in the most recent version of ipfw and dummynet, developed and tested over the past two months in the ipfw3-head branch. This also happens to be the same code available in the Linux and Windows ports of ipfw and dummynet.
The major enhancement is a completely restructured version of dummynet, with support for different packet scheduling algorithms (loadable at runtime), faster queue/pipe lookup, and a much cleaner internal architecture and kernel/userland ABI which simplifies future extensions.
In addition to the existing schedulers (FIFO and WF2Q+), we include a Deficit Round Robin (DRR or RR for brevity) scheduler, and a new, very fast version of WF2Q+ called QFQ.
Some test code is also present (in sys/netinet/ipfw/test) that lets you build and test schedulers in userland.
Also, we have added a compatibility layer that understands requests from the RELENG_7 and RELENG_8 versions of the /sbin/ipfw binaries, and replies correctly (at least, it does its best; sometimes you just cannot tell who sent the request and how to answer). The compatibility layer should make it possible to MFC this code in a relatively short time.
Some minor glitches (e.g. handling of ipfw set enable/disable, and a workaround for a bug in RELENG_7's /sbin/ipfw) will be fixed with separate commits.
CREDITS: This work has been partly supported by the ONELAB2 project, and mostly developed by Riccardo Panicucci and myself. The code for the qfq scheduler is mostly from Fabio Checconi, and Marta Carbone and Francesco Magno have helped with testing, debugging and some bug fixes.
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