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21-24 Mbps not enough bandwidth to stream On Demand!?!


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130 replies to this topic

#126 OFFLINE   wilbur_the_goose

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Posted 25 May 2013 - 02:15 PM

Just a question for people with issues - have you checked your router's QOS (quality of service) settings?

 

This might help:  http://www.howtogeek...on-your-router/


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#127 OFFLINE   dennisj00

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Posted 29 May 2013 - 06:14 PM

From what I've read about QOS on home routers - even with dd-wrt or Tomato, it's pretty useless.



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#128 OFFLINE   slice1900

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Posted 29 May 2013 - 07:32 PM

From what I've read about QOS on home routers - even with dd-wrt or Tomato, it's pretty useless.

 

 

Yes, unfortunately that is the case. None of them implement it at all properly, so it reduces overall performance if you enable it except in very specific circumstances. The biggest problem though is that it only works on your end of the link. Typically the problem you want to solve isn't prioritizing the data you are sending (which is all the router's QoS can do) but the data you're receiving. There is limited control exercised by holding back ACKs or reducing TCP window size on the connections you want at a lower priority, but it is mostly pointless without cooperation from the other end.


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#129 OFFLINE   mattnboise

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Posted 31 May 2013 - 04:50 AM

Does anyone know what Directv's streaming architecture is like? Is everything streamed from their LA office or do they have a distributed system using Akamai or similar? If no one knows for sure, we could find out via people who live in various places around the country streaming something from them and checking the NAT table on their router to see where the endpoint of the connection is.

 

If everything goes through LA, then people on the east coast are always going to have more problems than people who live closer to LA - unless they have a mirror datacenter out east, in which case the people who live in the central US are most likely to have problems. The further you are from the server you're streaming from, the more chance there is of a problem along the path. Latency doesn't matter for streaming, but larger latency does magnify the effect of any dropped packets.

 

If everyone is having problems all at the same time no matter where they are located, for instance if a bunch of people all report problems streaming from Directv at 11 PM EDT this Friday, then we can conclude it is a problem on Directv's end, which they can fix by adding more servers and/or more bandwidth to the outside.

 

When you read about Apple, Google, Amazon, Facebook and Microsoft continually building big datacenters in various places around the country and around the world, a lot of it is for this reason - get their content closer to the customer. Directv can't afford to do something like that, so they'd likely use a content delivery network like Akamai or Level3.

 

 

From my vantage point I can see many 10G ports spread around the country and they also colocate equipment in our datacenters.

I know that they have similar setups with other Teir 1 providers.



#130 OFFLINE   mark40511

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Posted 02 June 2013 - 05:59 AM

I have QOS disabled in my router settings. In fact, I think it's disabled by default.


Edited by mark40511, 02 June 2013 - 06:00 AM.


#131 OFFLINE   veryoldschool

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Posted 02 June 2013 - 06:46 PM

I've had a chance to try OnDemand while staying with a friend and found some different results.

The ISP service is 50 Mb/s, yet Cinemax has been very troublesome.

Watch Now keeps running out of buffer and going to the download [1080 verses the 720p] has taken much longer. With U-Verse it would "only" take twice as long [1 hour show took 2 hours], but with this cable service it's taking closer to 3 hours.

 

With all this bandwidth, and more than one DVR, I started downloading two at the same time.

 

To my surprise, the other DVR is downloading much faster.

 

Both are on the same coax network with a CCK hardwired to the router.

 

The HR24 only has 9 mins of recording after 26 mins, while the HR21 has 41 mins after 36 mins.

 

If you've got the bandwidth and more than one DVR, you might want to check to see if your slow OnDemand is the same.


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