netdev - Re: [WARNING - VERY LONG] A sysadmin's understanding of HFSC and IFB

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Message-ID: <1323842291.8451.176.camel@denise.theartistscloset.com>
Date:	Wed, 14 Dec 2011 00:58:11 -0500
From:	"John A. Sullivan III" <jsullivan@...nsourcedevel.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [WARNING - VERY LONG] A sysadmin's understanding of HFSC and
 IFB

On Tue, 2011-12-13 at 18:01 -0500, John A. Sullivan III wrote:
> On Fri, 2011-12-09 at 08:59 +0100, Eric Dumazet wrote:
> > Le vendredi 09 décembre 2011 à 02:17 -0500, John A. Sullivan III a
> > écrit :
> > > Hello, all.  I've been trying to summarize my last week's worth of
> > > research into HFSC and IFB.  Being neither a developer nor a
> > > mathematician, I found most of the existing documentation daunting and
> > > am truly grateful for the help I received on this list to understand the
> > > technologies.
> > > 
> > > I do not currently have a blog to post this research and so was thinking
> > > of posting it to this list so that it could be archived and searchable
> > > for other poor sysadmin types like me to save them the days of
> > > struggling to get their practical heads around the concepts.
> > > 
> > > However, since this is probably a 15 page or so document, I realized
> > > this could be quite rude to those on dial up or metered connections.
> > > Would it be appropriate to post my summary here? Thanks - John
> > > 
> > 
> > Please post here, thats definitely a good idea.
> > 
> > I am pretty sure your contribution could serve to add a page to 
> > 
> > http://www.linuxfoundation.org/collaborate/workgroups/networking/group
> > 
> > I believe we lack documentation. A lot.
> <snip>
> OK - it's almost ready.  The only problem I know if is that, when I do
> the math based upon my explanation, I sometimes violate an rt curve when
> I should not.  I posed that in an email to the list entitled "An error
> in my HFSC sysadmin documentation".  If anyone can figure out where my
> error is, I will gladly change the documentation.  Here's what I have.
> The graphics except the ASCII art are obviously missing.  All
> corrections and suggestions very gratefully accepted - John
> 
<snip>
I realize I was using an incorrect definition of backlogged (needing
more bandwidth than the guaranteed bandwidth) and have corrected (having
a packet in queue) - John

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