Originally posted by solsun
I completely disagree for several reasons.
1. The article clearly states that this service will be utilizing a newly patented caching system.
2. Streaming is definitely NOT the same thing as downloading... A 2 hour film at say standard definition quality could take upwards of 3-6 hours to download, your average Joe is not going to wait that long.. However, If the file were streaming and using an enhanced caching system along with Apple's new Broadband Tuner app, the file could begin being viewed within several minutes of the purchase, even with a standard broadband connection.
3. Broadband Tuner 1.0 - that little app that Apple came out with last week, it makes sense now....
FROM APPLE SITE:
What does the Broadband Tuner do exactly?
The installer increases the default values for the size of the TCP send and receive buffers. With larger buffers more data can be in transit at once. A startup configuration file is also updated so that these changes will persist across restarts.
This change has a system wide effect and is applied even if the network is not high speed connection with a high latency, with the exception of modem connections for which the system uses small default TCP buffer sizes.
The first two points are clearly wrong. Caching may help Apple keep these files on their own machines, or as Greg says, keep a large part on our own drives - but that is exactly what the article says is NOT going to happen.
When I view a streamed video, my high bandwidth connection (6.144MBS) usually downloads the file long before the file is finished being presented to me on screen. But, if your connection is much slower, say 1.5MBS, then you will have to wait before it even starts. How long will depend upon the file size and resolution.
Broadband tuner is supposed to help latency for hi speed connections. It only has an effect if your connection, first of all, HAS much latency, is truely fast, 5MBS, at least, and your isp will allow it. That last point is something that hasn't been talked about. Some isp's won't allow large packets.
Even if it does work for you, and I've been experimenting with it and have found no improvement on most connections, it won't do more than a 10-20% improvement. Nice, but not major.
If you check Safari's speed numbers in the download window, you can see if this will help. Divide your download speed in bits, as that's how it's rated, by 8. That will give you bytes per second. That is theoretical. Subtract between 15 to 25% of that number, and you will get the maximum bandwidth available to you.
EDIT: sorry, I didn't mean to divide the number in Safari's download window. That is just to check if the number you come up with matches what you are getting in the real world.
For me, the first number is 768,000 bytes per sec. The second, subtracting, say, 20%, gives me 614,400 bytes per sec, which is about right for me. Actually I get a bit more, about 650,000.
The rest is the network chatter. Some of that can possibly be eliminated with Broadband Tuner, but not all.
So you can figure out how much this really helps. Add some of that bandwidth back that you subtracted, but keep 8 to 10% off, you can't get rid of those last few percent.