Hi
It's really happy to know that you are verifying the problem I pointed out in my paper. It's quite urgent to pay more attentions to the bufferbloat in CellNet in my opinion.
But because of the lack of connections inside carriers (AT&T, Verizon, etc.), in my work I still found some limitations to figure out the fundamental answers to 1). where the buffers exactly are; 2). how the buffers are built up with interacting with LTE/HSPA/EVDO protocols; 3). how common it is for large scale daily life usage the problem could lower down user experiences..... All those problems, I hope to see deeper discussions in this maillist. Thanks....
Best,
Haiqing Jiang
On Mon, Jan 7, 2013 at 11:35 PM, Ingemar Johansson S
<ingemar.s.johansson@ericsson.com> wrote:
Hi
Include Mark's original post (below) as it was scrubbed
I don't have an data of bufferbloat for wireline access and the fiber connection that I have at home shows little evidence of bufferbloat.
Wireless access seems to be a different story though.
After reading the "Tackling Bufferbloat in 3G/4G Mobile Networks" by Jiang et al. I decided to make a few measurements of my own (hope that the attached png is not removed)
The measurement setup was quite simple, a Laptop with Ubuntu 12.04 with a 3G modem attached.
The throughput was computed from the wireshark logs and RTT was measured with ping (towards a webserver hosted by Akamai). The location is Luleċ city centre, Sweden (fixed locations) and the measurement was made at lunchtime on Dec 6 2012 .
During the measurement session I did some close to normal websurf, including watching embedded videoclips and youtube. In some cases the effects of bufferbloat was clearly noticeable.
Admit that this is just one sample, a more elaborate study with more samples would be interesting to see.
3G has the interesting feature that packets are very seldom lost in downlink (data going to the terminal). I did not see a single packet loss in this test!. I wont elaborate on the reasons in this email.
I would however believe that LTE is better off in this respect as long as AQM is implemented, mainly because LTE is a packet-switched architecture.
/Ingemar
Marks post.
********
[I tried to post this in a couple places to ensure I hit folks who would
be interested. If you end up with multiple copies of the email, my
apologies. --allman]
I know bufferbloat has been an interest of lots of folks recently. So,
I thought I'd flog a recent paper that presents a little data on the
topic ...
Mark Allman. Comments on Bufferbloat, ACM SIGCOMM Computer
Communication Review, 43(1), January 2013.
http://www.icir.org/mallman/papers/bufferbloat-ccr13.pdf
Its an initial paper. I think more data would be great!
allman
--
http://www.icir.org/mallman/
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-----------------------------------
Haiqing Jiang,
Computer Science Department, North Carolina State University