Re: [aqm] RED implementation on Linux 3.14.22
Dave Taht <dave.taht@gmail.com> Mon, 15 December 2014 16:17 UTC
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Date: Mon, 15 Dec 2014 08:17:29 -0800
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From: Dave Taht <dave.taht@gmail.com>
To: Jim Gettys <jg@freedesktop.org>
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Cc: Simone Ferlin-Oliveira <ferlin@simula.no>, "aqm@ietf.org" <aqm@ietf.org>
Subject: Re: [aqm] RED implementation on Linux 3.14.22
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On Mon, Dec 15, 2014 at 7:54 AM, Dave Taht <dave.taht@gmail.com> wrote: > On Mon, Dec 15, 2014 at 5:41 AM, Jim Gettys <jg@freedesktop.org> wrote: >> >> >> On Mon, Dec 15, 2014 at 2:51 AM, Simone Ferlin-Oliveira <ferlin@simula.no> >> wrote: >>> >>> All, >>> >>> I am doing some work with shared bottleneck detection that requires >>> some evaluation with different AQM, in particular, RED. Since I >>> haven't been following the evolution of the implementation, I would >>> like to ask about your experience with the code on Linux 3.14 (and >>> newer). I need to clarify something about "newer". The third parameter in Linux is for bug fixes only. 3.14 is the major release, a 3.14.22 was 22 bug fix releases. A -X or 4th parameter, if it exists, is distro specific changes, which can often, particularly in major distros like redhat or ubuntu, be quite extensive. "New features", such as the ones I mentioned in the previous email, generally do not make it to the bug fix releases, and I don't know if (for example) the hystart change or GSO half cwnd change will make it to the -stable tree for older releases (without checking), as usually only security or crash critical bugs make it into stable. I mention this in light of a fairly recent DCTCP paper which used a pre-bufferbloat-fixes kernel of 3.2.something, discussed (Well, ranted about slightly, apologies) here. https://lists.bufferbloat.net/pipermail/bloat/2013-November/001736.html (I would dearly like to see that paper's experiments revised and updated in light of that discussion, now that all these other fixes have landed, and DCTCP is now in mainline linux.) I try to publish a simple debian kernel build script, and my own patch set of the codel-related research in progress regularly, somewhere: http://snapon.lab.bufferbloat.net/~d/codel_patches/ and will probably restart publishing a separate debloat-testing tree for the upcoming make-wifi-fast effort, as that set of changes is going to be quite extensive, and buggy, for a while. -- Dave Täht http://www.bufferbloat.net/projects/bloat/wiki/Upcoming_Talks
- [aqm] RED implementation on Linux 3.14.22 Simone Ferlin-Oliveira
- Re: [aqm] RED implementation on Linux 3.14.22 Jim Gettys
- Re: [aqm] RED implementation on Linux 3.14.22 Dave Taht
- Re: [aqm] RED implementation on Linux 3.14.22 Dave Taht
- Re: [aqm] RED implementation on Linux 3.14.22 Simone Ferlin-Oliveira