From: Dave Taht <dave.taht@gmail.com>
To: cake@lists.bufferbloat.net
Subject: [Cake] packet mass, ecn, and a fractional count
Date: Thu, 7 May 2015 19:32:03 -0700 [thread overview]
Message-ID: <CAA93jw7NmPhbJWmmxssdH_3GynGX4X2wuD9DzaqkFZ7OcFCyew@mail.gmail.com> (raw)
from observing behaviors with large numbers of flows, fq_codel derived
algorithms start to struggle to achieve the desired delay, cake
seemingly less so, and perhaps this is related to collisions also.
A thought would be to use a fractional (fixed point) increment to
count rather than "1" when larger numbers of flows are present.
The original ns2 model started applying a slightly different fraction
to count in certain circumstances. It is quite doable in the 32 bit
int to reserve a few bits for a fixed point fraction (say, 4 bits),
but to apply it as the number of flows in play grows, not sure.
See also the tracy widom distribution.
--
Dave Täht
Open Networking needs **Open Source Hardware**
https://plus.google.com/u/0/+EricRaymond/posts/JqxCe2pFr67
next reply other threads:[~2015-05-08 2:32 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-08 2:32 Dave Taht [this message]
2015-05-08 5:12 ` Jonathan Morton
2015-05-09 16:37 ` Dave Taht
2015-05-09 17:59 ` Jonathan Morton
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