Joao Barros wrote:
On 9/8/07, Bahman M. <[EMAIL PROTECTED]> wrote:
Hi all,
I have an ADSL connection at home.
When I'm _uploading_ files the whole upload bandwidth is consumed; so
far so good.
But when _downloading_ no more than 30~40% of download bandwidth is
consumed.
The guys in the ISP say they've granted me the requested bandwidth but
this is not what I see in action.
How may I know the real bandwidth limits of my connection? Any tool or
trick? Or maybe I'm misunderstanding something about ADSL bandwidth?
First of all you have to take into account that with an ADSL
connection, I'm guessing PPPoE, you have overhead due to protocol
tunnelling.
The connection is a simple ethernet connection (sorry, I don't know the
exact technical name) which requires no authentication and setup (I have
a valid static IP address). On a fresh system, I just need to specify
gateway IP and my own machine's and plug the cable in and it starts working
Next you must verify that you don't max out your upload while testing
download speed. From my tests, up to 90% upload bandwidth usage is
safe and shows no impact on download performance.
Tested while not uploading and the results were the same.
And for last, use multiple download sources as only one may not be enough.
Find http or ftp mirrors close to you (on your ISP for ex) and start
downloading multiple ISOs for example.
I tested the connection by downloading 2~3 files simultaneously and used
'bmon' as Mel suggested in another reply (thanks to him). As I'd
already guessed the RX don't get bigger than 30~40% of the expected
bandwidth. I performed the test with some other files and there was no
difference.
Note: Make sure the device taking care of the PPPoE connection is
powerful enough to support your bandwidth. For example, I still have a
Linksys WRT54GL as router and I can easily see 100% cpu usage and load
1 and thus I can't use my max contracted bandwidth. Use the modem or
a powerful enough machine running FreeBSD of course :)
Don't worry about that! My connection is such slow that even the
primitive NICs and CPUs would handle it :-)
Thanks,
Bahman
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