[Bloat] T-Mobile LTE buffer bloat

[Stefan Alfredsson]

Hi, Stephen, the list,

We're running a 3G/4G measurement site at Karlstad university, with 
mobile broadband subscriptions from the four major telecom operators in 
Sweden. I was curious to see how measurements in our network would 
compare to yours, so I did a measurement run with netalyzer.

To summarize, the measured buffering is well below one second for all 
tests, although the results are not directly comparable since we are 
using directly attached USB modems (Huawei E392 with Ubuntu 12.04) 
instead of a separate router box. However, the numbers might be 
interesting in a more general perspective.

Tele2 LTE: Upload 12 Mbit/s, 240 ms buffering, Download > 20  Mbit/s, 
buffering not measurable
http://n1.netalyzr.icsi.berkeley.edu/summary/id=43ca253f-6593-7f837e62-5321-488e-b480

Tele2 HSPA+: Upload 1.1 Mbit/s, 630 ms buffering, Download > 20 Mbit/s, 
509 ms buffering
http://n2.netalyzr.icsi.berkeley.edu/summary/id=43ca208a-23052-a0e80cbb-9a7c-44e0-ba88

Telenor LTE: Upload 16  Mbit/s, 190  ms buffering, Download >20  Mbit/s, 
470 ms buffering
http://n3.netalyzr.icsi.berkeley.edu/summary/id=36ea240d-31617-45bca5e3-53ef-450e-a9bf

Telenor HSPA+: Upload 3.4 Mbit/s,  200 ms buffering, Download > 14 
Mbit/s, 490 ms buffering
http://n3.netalyzr.icsi.berkeley.edu/summary/id=36ea240d-31612-c6d0d98d-8bcf-4a03-832d

Telia LTE: Upload 18 Mbit/s, 140 ms buffering, Download > 20 Mbit/s, 
buffering not measurable
http://n3.netalyzr.icsi.berkeley.edu/summary/id=36ea240d-31599-1ebc684e-c164-4786-832a

Telia HSPA+: Upload 1.1 Mbit/s, 630  ms buffering, Download > 20 Mbit/s, 
640 ms buffering
http://n2.netalyzr.icsi.berkeley.edu/summary/id=43ca208a-22984-40c59ae2-0c36-4e67-9039
(note similarity with Tele2 HSPA+ - IIUC Tele2 and Telia share the 3G 
network infrastructure)

Tre LTE: Upload 19 Mbit/s, 150 ms buffering, Download > 20 Mbit/s, 98 ms 
buffering
http://n3.netalyzr.icsi.berkeley.edu/summary/id=36ea240d-31648-86a273a5-82ae-4929-a634

Tre HSPA+: Upload 3.5 Mbit/s, 190 ms buffering, Download > 8.6 Mbit/s, 
780 ms buffering
http://n1.netalyzr.icsi.berkeley.edu/summary/id=43ca253f-6609-3316da33-9ea6-41ca-a8ac


For reference, I also made a measurement from the same host, but using a 
wired connection over the Swedish university network: Upload was 
measured to > 20 Mbit/s and download to 15 Mbit/s, with no measurable 
buffering.
http://n1.netalyzr.icsi.berkeley.edu/summary/id=43ca253f-6563-078896ce-dc0a-4333-9119 


Regards,
   Stefan Alfredsson



On 10/31/13 00:25 , Stephen Hemminger wrote:
> I got one of these Samsung LTE hotspot.
> Not surprisingly it has huge bloat and a stupid http proxy
> that netalyzer claims rewrites images.
>   
> Bandwidth: Up 1.6 Mbit/sec Down 4.3Mbit/sec
> Latency: 140ms 0% loss
> Buffering: Uplink 5100ms Down 1800ms
>
> How can the uplink side be so bad! 5 seconds???
>
> Might even return it as defective. You can't even add a review on their
> website. Probably they would end taking down like Apple.
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