Dave,

Thanks for the reply. I should have made it clearer that I am not running this on a Netgear 3800, I am running the sqm system on an Atom D510 box at 1.66 GHz (two cores + hyperthreads) with 2 GB RAM and good Intel NICs. While running the rrul, the CPU is barely breaking a sweat.

The OS is Ubuntu server and I've made a nice wrapper to run simple.qos via the if-pre-up/post-down hooks.

Can you suggest any tweaks to the settings that would better take advantage of the extra CPU that I have?

Thanks,
Bill

On 03/05/2015 10:43 AM, Dave Taht wrote:

well, cerowrt's inbound shaper runs out of cpu at +60mbits. That is
possibly part of your problem.

the peaks you are seeing are not bad - but to me, probably indicative
of running out of cpu, which will among other things, drop packets
burstily.

As comcast has rolled out 100mbit+ service in a ton of places
(including my home), we really, really, really need to find a way to
do better rate shaping at higher speeds (or develop a faster policer)
on some successor hardware.

If you turn off inbound shaping (0 for that parameter) my measurements
typically show over 600ms of latency on inbound on comcast at 100mbit
down, but at least, doing the tcp_upload tests, we can hold the upload
more under control. It is a totally unsatisfactory thing to have
downloads got so much out of control, it really messes up other
things, inside of a few seconds, on big downloads, but at this point I
have to recommend turning off inbound shaping and just living with it.

Very high on my list now is finally writing (or tom sawyering someone
into writing!) "bobbie - the kinder, gentler policer" in the hope that
that could actually run faster and better than shaping does on this
low end hardware.



On Thu, Mar 5, 2015 at 7:35 AM, William Katsak <wkatsak@gmail.com> wrote:

Hello all,

I just moved and had to switch my ISP from Optimum (Cablevision) to Comcast
(100/10 link).

I am running my own port of simple.qos over to Debian/Ubuntu, and it worked
fine on Cablevision (I basically use scripts in if-pre-up.d and
if-post-down.d to set the variables set up/tear down simple.qos).

However, since I moved over to Comcast, I am seeing something like 600 ms of
uplink buffering according to Netlyzer. Also, the Internet browsing "feels"
slow when Netflix is in use elsewhere in the apartment (like before I knew
anything about bufferbloat).

My config looks like this:
UPLINK=7500
DOWNLINK=85000
QDISC=fq_codel
LLAM="tc_stab"
LINKLAYER="none"
OVERHEAD=0
STAB_MTU=2047
STAB_MPU=0
STAB_TSIZE=512
AUTOFLOW=0
LIMIT=1001   # sane global default for *LIMIT for fq_codel on a small memory
device
ILIMIT=
ELIMIT=
ITARGET="auto"
ETARGET="auto"
IECN="ECN"
EECN="NOECN"
SQUASH_DSCP="1"
SQUASH_INGRESS="0"
IQDISC_OPTS=""
EQDISC_OPTS=""
TC=`which tc`
#TC="sqm_logger tc"# this redirects all tc calls into the log
IP=$( which ip )
INSMOD=`which modprobe`
TARGET="5ms"
IPT_MASK="0xff"
IPT_MASK_STRING="/${IPT_MASK}"     # for set-mark

I've also attached the output of a run of rrul against
netperf.bufferbloat.net.

Any insight?

Thanks,
Bill


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