[Cake] Fwd: longer rtt codel/cake testing with remote servers

Dave Taht dave.taht at gmail.com
Mon Jan 18 17:46:45 EST 2016

somehow this string of emails got eaten before I left

---------- Forwarded message ----------
From: Dave Taht <dave.taht at gmail.com>
Date: Wed, Dec 23, 2015 at 6:08 AM
Subject: longer rtt codel/cake testing with remote servers
To: cake at lists.bufferbloat.net

I have long maintained a set of servers suitable for testing at a
range of RTTs, but did not publish them because I'd had no desire to
maintain them personally [1] for wide use, they are "in the cloud", so
I do not trust their network behavior not much past 100mbit,  I
frequently used shapers on them merely to get interesting bandwidths
at varieties of RTTS, and they cost 10 bucks a month each which I have
sometimes needed for food.

If people truly want to get a feel for how to modify codel without a
lab handy, these boxes would be good to test against - and have long
term flent data sets against, at typical home bandwidths, from your
home. The most basic multi-rtt tests are the rtt_fair tests, but the
rrul and tcp_upload/dlownload tests are also good for seeing the
interactions on long rtts...

and it's always good to do occasionally do a test to, like, tokoyo and
wonder why tcp even works at all.

I would like to find flent  servers in finland, russia, australia/nz
spain, and elsewhere in the eu. [1]

These machines are active subdomains of bufferbloat.net.

netperf-west: defunct (was snapon)
netperf-east I do not know where this is actually
netperf-eu - this is toke's server somewhere

flent-atlanta # georgia
flent-dallas  # texas
flent-freemont  # california
flent-london  # england - this is also taht.net, at the moment
flent-newark # new jersey
flent-tokyo # japan

[1] maintainer wanted. Also could use d-itg set up on them. Securely.
I also do not remember if they all have ecn enabled by default or not.
Several run the fq qdisc. I am in  the progress of migrating several
to kvm from xen.

I would argue for consistently using sch_fq on these servers with ecn
always enabled. I will check today.

Dave Täht
Let's go make home routers and wifi faster! With better software!

More information about the Cake mailing list