Iâve set up an ftp server. My ISP is giving me an ADSL connection with an
speed they say is 768k for uploads and 8meg down. And yet Iâm seeing my uploads are
around 85k and 90k.
I need faster uploads. Can I change something about my system to make that
happen?
Thereâs one big potential point of confusion here, so letâs take this
opportunity to review upload and download speeds, what they really mean, and
what you can do to maximize them.
Become a Patron of Ask Leo! and go ad-free!
The person asking the question had also gone to some of the on-line speed
testing sites, such as that at Broadband
Reports. The numbers being show there more-or-less matched the figures that
his ISP was providing.
Thatâs actually good news. And, to be honest, Iâm quite jealous. 768k up /
8meg down looks wonderful to me â because of telephone company limitations (and
no cable in my area) Iâm limited to 128k up and 768k down. Once upon a time
that was blazingly fast. Now, not so much. Did I mention Iâm jealous?
But just what do those numbers mean?
First, realize that theyâre measurements in bits per second
or bps. That means on my DSL connection, I can upload at a maximum
speed of 128k, or 131,072 (128 x 1,024) bps. Similarly, I can download at a
maximum of 785,432 (768 x 1,024) bps. My faster questioner can upload at
785,432 bps and download at a whopping 8,388,608 (8 x 1,024 x 1,024) bps.
But we measure downloads and file sizes in bytes not bits. So a
more meaningful number might be the download speed in Bytes per second (Bps â
notice that the âBâ is capitalized? Subtle.) With 8 bits to a byte, a speed of
768k bits per second works out to ⊠98,304 Bytes per
second, or 96KBps.
So when you say that youâre seeing uploads at around â85k and 90kâ it leads
me to wonder if youâre measuring your uploads in Bytes per second, and
comparing to the line speed expressed in bits per second. If thatâs
the case, then the numbers youâre seeing are quite reasonable.
Why arenât they actually at the 96KBps I calculated your line speed to be in
Bytes per second?
In a word: overhead. If youâre measuring based on file size, then the
communications protocols involved in transferring that file break it up into
âchunksâ, adding a little bit of overhead data to each chunk to create a packet
that can then be properly reassembled into the original file. There are also
overhead delays involved in most communications protocols â the time it takes
to start sending each packet and the time it takes to verify and acknowledge
back that the packet was properly received.
internet is most likely your real bottleneck.â
Because of that overhead, I typically just divide by 10 for a rough estimate
of actual, effective transfer rate. My 768kbps DSL roughly downloads
at around 76KBps, or 76k Bytes per second. Very roughly. But itâs slightly
easier math, then, to see about how long my next download will take.
And of course other network traffic can affect the effective speed as well.
If youâre downloading your email while youâre uploading a file on the same
internet connection, both operations will slow down some. If youâre on cable,
youâre actually sharing your bandwidth with your neighbors â so if theyâre doing something
internet-intensive, that could also impact your speeds.
The bottom line here is that your connection to the internet is most likely
your real bottleneck. Barring other software on your machine thatâs âclogging
the lineâ trying to do something on the internet at the same time you are,
youâre at the mercy of the capacity of that line, and what your ISP can provide
you.
Have to agree that he may be looking at KBps instead of Kbps. When Iâm using WinSCP to upload it reports in bytes per second, not bits. But, as a caveat, in an upload/download, it always takes two to tango.
If youâre uploading to a heavily used server, it may well be that enough of its available incoming bandwidth is being parceled out to other uploaders and server functionss that it only has 85-90 kilobits per second available for receiving your upload. That would explain your observed speeds.
I have an 8/768 line through Comcast, but my cable doesnât enter the house anywhere near my home office, so I use BPL (Broadband over Power Line) bridges to connect the router in my home office to the cable modem in another room.
That gives me an effective speed of around 4400/695, which is around what I was getting with a 6/768 DSL line going straight into the office that cost me 2x as much.
I donât mention my speeds to help you, though. Itâs just to rub it in with Leo. Comparing his house to mine is like comparing a Bentley to a Honda. So, though I have âestate envyâ, I have at least this one thing to feel smug about.
A surprise to me was finding out that as the available bandwidth goes up older routers may actually be a limiting factor (at least for download). Tomâs Hardware recently put up a chart showing upload and download capabilities of routers over time and some of the older ones wonât keep up with 8mbs down. A friend of mine recently confirmed this on his connection by after swapping out a fairly old LinkSys.
See:
http://www.tomsnetworking.com/2006/03/31/hardware_router_chart/
KSS
How much wattage does a laptop require, I have a HP and a Dell and I want to use them in my truck
it varies. Take a look at the power adapter and it should have a wattage rating on it.
You are getting right at your true speed⊠You are looking at the wrong term..
90KB X 8 = 720Kb/s uploadâŠ
DONT get Kb and KB mixed up.. many people do.
90 times 8 is 720
I have AT&T Uverse 18max, 18meg download speeds and about 1.5 upload. My PC with wireless modem does a speed test about 8500 download & 1500 upload from St Louis to Chicago, BUT my cheap $600 HP laptop with built in wireless WIFI modem gets 17,500 download speeds and 1500 upload in the same room. What gives? They both have Norton Internet Security, and even if I turn it all off on my PC, nothing changes. I made sure the Windows firewall is turned off, ran a defrag, scandisk, full virus scan, see no other processes running etc., and it still wonât budge above 8500 download. So why does my cheap ass laptop get faster download speeds? I have 2meg of RAM in my PC, more than the 512k in my laptop. Do I have to delete pics, music & movies for it to get faster? I donât see what difference that would make since none of them have anyhing to do with active programs. Please give me a suggestion on what to do. Thanks.
Figured it out. Had to adjust my packet size. Now getting what Iâm paying fo