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07-02-2009, 08:22 PM #1Web Hosting Guru
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Question for who has a 10mbps unmetered server
Hello,
I know that there are a lot of threads talking about 10mbps unmetered lines, but I didn't want to go into other peoples threads with a different question:
What is your download speed on your 10mbps unmetered server?
We have a server that we can download this file:
http://download.microsoft.com/downlo...dotnetfx35.exe
with far less then 500kb/s, when I asked the DC for support about this I gott this answer:
- You're on a 10Mbps network so you won't get over 1MB/s speeds.
weird, as I have a 10mbps unmetered VPS in another location that can download that file at 6.5mb/s.
When I asked again with another question, I got a new answer which was:
6MBytes/s = 48Mbps
So you can't be on a 10Mbps network.
1 Bytes/s = 8 bit/s
So my question is:
What speed do you have? is this informations correct?
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07-02-2009, 08:25 PM #2Web Hosting Master
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1MB/s = ~10Mbps
10MB/s = ~100Mbps
100MB/s = ~1000Mbps
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07-02-2009, 08:26 PM #3Aspiring Evangelist
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10Mbit = 1.25MBit.
Bits is the number of zeros/ones sent over the wire.
A byte is an octet of bits, usually representing a character.
Pretty much all carriers advertise in bits. Your computer displayed download speed in bytes.
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07-02-2009, 08:27 PM #4Web Hosting Master
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Yeah but there's overhead, network conditions, etc
Your 6.5MB/s is probably on a 100mbit port, shared, and you have about 3TB bandwidth per month to use.
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07-02-2009, 08:32 PM #5Web Hosting Guru
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yeah, could be that!
so this result in a 10mbps is ok:
Connecting to download.microsoft.com|68.142.110.42|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 242743296 (231M) [application/octet-stream]
Saving to: `dotnetfx35.exe.1'
2% [=> ] 6,587,514 402K/s eta 12m 54s^
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07-02-2009, 08:41 PM #6Aspiring Evangelist
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Yes thats about 8.5 Mbit. Add the overhead quantumphysics mentioned, and that makes sense.
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07-02-2009, 09:22 PM #7Web Hosting Master
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Wrong.
1MB/s = 8Mbps
10MB/s = 80Mbps
100MB/s = 1000Mbps
1 byte(B) is always exactly equal to 8 bits (b). There is absolutely no approximation involved.
I think you meant to say 10Mbit = 1.25MBytes.
402KB/s = 3.216Mb/s, which is perfectly reasonable.
Firstly, it is very unusual to see line speed with a single TCP data transfer. To truly benchmark your capacity, you should try using a network diagnostic tool like iperf, netperf, etc. rather than http/ftp. Even so, this only tells you what the capacity is between two particular locations, it will not tell you what either end is capable of.
Secondly, transfer rates are strongly dependent on latency (RTT). 3.216Mb/s is lousy if transferring within the same data centre, but excellent when transferring between London and Beijing.ASTUTE INTERNET: Advanced, customized, and scalable solutions with AS54527 Premium Performance and Canadian Optimized Network (Level3, Shaw, CogecoPeer1, GTT/Tinet),
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07-02-2009, 09:30 PM #8Aspiring Evangelist
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I think what he meant is the relation between the line speed, and what you will see downloading a file. I believe most file transfer statuses just take the difference of bytes for the file received over the time. It doesn't include packet headers, checksums, bad packets that failed the checksum and had to be resent, etc...
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07-02-2009, 11:32 PM #9Web Hosting Master
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ASTUTE INTERNET: Advanced, customized, and scalable solutions with AS54527 Premium Performance and Canadian Optimized Network (Level3, Shaw, CogecoPeer1, GTT/Tinet),
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07-03-2009, 12:10 AM #10Aspiring Evangelist
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07-03-2009, 03:05 AM #11Web Hosting Master
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07-03-2009, 03:09 AM #12Disabled
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07-03-2009, 01:23 PM #13Web Hosting Master
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The converse of a statement has a different logical inference.
http://www.math.jhu.edu/~swang/logic.htm
/pedantismASTUTE INTERNET: Advanced, customized, and scalable solutions with AS54527 Premium Performance and Canadian Optimized Network (Level3, Shaw, CogecoPeer1, GTT/Tinet),
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07-03-2009, 02:05 PM #14Aspiring Evangelist
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07-03-2009, 04:10 PM #15Web Hosting Master
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Your server that can do 6.5MBps is on a 100Mbps port.
http://www.ibeast.com/content/tools/band-calc.asp
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07-03-2009, 09:39 PM #16Aspiring Evangelist
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07-03-2009, 10:20 PM #17Web Hosting Master
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Argh. Again this talk about Mbps and MB/s ...
Bandwidth is a RATE -> bits per second.
Data transfer is an amount.
Your server network port and the switch port don't know what is a BYTE. They move BITS.
Network protocols don't know what is a byte. A sequence of 8 bits is called an octet, not a byte.
Protocols use control bits, adding overhead for the payload transmitted in each packet.
Eventually there are additional overhead due protocol acknowledgements, timeouts, retransmits, etc.
It is wrong to say data transfer = bandwidth / 8
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