[Cerowrt-devel] Comcast Uplink Buffers

[William Katsak <wkatsak@gmail.com>]

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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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William Katsak <wkatsak@gmail.com>
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