chrisbmoore
join:2003-08-28
Frederick, MD
| reply to BadHat
Re: Awesome
They need to start making these speeds constant for both up and downstream, that would be the major improvement. I like to watch videos over launch.com and I found until Adelphia just raised their cap on upload to 256k it was impossible to watch the videos, leadign me to conclude that upstream is almost as important if not moreso than downstream. |
|
KnightDreams
Coming Back Is Slow But Coming.
join:2002-05-08
Saint Charles, MO
clubs: | Not to throw a wrench but what does upload have to do with "watching" videos.
--
Frank Amo |
|
nklb
Premium
join:2000-11-17
Ann Arbor, MI
clubs:
| said by KnightDreams  :
Not to throw a wrench but what does upload have to do with "watching" videos.
It has plenty to do. In TCP/IP, a packet's receipt has to be acknowledged, so by downloading full on at 1.5mbps, you would need about 128kbps up just for the return packets. Now that speeds are 3mbps down, you would need even more upload.
--
for all your Linux questions |
|
KnightDreams
Coming Back Is Slow But Coming.
join:2002-05-08
Saint Charles, MO
clubs: | I have no problem watching videos online, and I download at 2.7mbps and upload at 187kbps.
--
Frank Amo |
|
indy0365
join:2001-08-25
Franklin, IN | I have no promlems watching videos 3/128 |
|
some_UDP_guy
@nokia.com | reply to nklb
But in streaming video, UDP is used instead of TCP, so there aren't Acks. |
|
_
| Windows Media Encoder(realtime video feeds) uses TCP. ShoutCast(usually audio, does work with video, just a pain to set up) uses TCP. Almost all on-demand streaming is accomplished through http over TCP, simply by downloading the file as it's playing. UDP is used mostly for online games and netconferencing(which can include video) and old RealVideo streams. But we all know that RealVideo is a fading format, don't we? Also, I would like to point out that depending on packet size, the bandwidth used by ACKs varies. Obviously, bigger packets means fewer ACKs, but more retransmission if a packet gets lost. Usually the ACKs for downloading at 1.5mbps amount to a total of about 5KBps(or 40kbps). It's not a major factor on your connection, however enough to cause your downloads to seriosuly slow down by a saturated upstream. nklb's estimates are way out of proportion. A 3mbps/128kbps connection would work just fine for *just downloading*. But don't try to upload at the same time -- it will kill your download speed.
But back to the original topic, the real question is when connections like Starpower(RCN)'s 3.5mbps/768kbps with as much of that upload available as you could possibly want per month(trust me, I know people who have tested this...^.~) will become standard. |
|
