How calculate my uploads & downloads and my capacity?

If I use 80% of my upload bandwidth (which I think may be 64 Kbps)
then does that mean my download bandwidth (which would be 300 Kbps)
is reduced by 80%?

The reason I ask this is because I am on an NTL 300 Kbps connection
(approx 33 KBytes/sec) and I notice when I am using P2P software that
my connection gets fully used up.

At those times my download rate is perhaps 8 KBytes/sec and my upload
rate is about 8 Kbytes/sec too. These seem very low values. Maybe
there is a formula I can use?

"Mister C" <(E-Mail Removed)> wrote in message
news:9652BBD67D1DB4F1A28@213.155.197.138...
> If I use 80% of my upload bandwidth (which I think may be 64 Kbps)
> then does that mean my download bandwidth (which would be 300 Kbps)
> is reduced by 80%?
>
> The reason I ask this is because I am on an NTL 300 Kbps connection
> (approx 33 KBytes/sec) and I notice when I am using P2P software that
> my connection gets fully used up.
>
> At those times my download rate is perhaps 8 KBytes/sec and my upload
> rate is about 8 Kbytes/sec too. These seem very low values. Maybe
> there is a formula I can use?
>

Give our calculator a try and let me know what you think of it
http://ben.cheetham.me.uk/data-usage-calculator

Chet

[Reply to uk.telecom.broadband only - I don't have access to the ntl:
newsgroups from Zen]

In message <9652BBD67D1DB4F1A28@213.155.197.138>, Mister C
<(E-Mail Removed)> writes
>If I use 80% of my upload bandwidth (which I think may be 64 Kbps)
>then does that mean my download bandwidth (which would be 300 Kbps)
>is reduced by 80%?

No.

>The reason I ask this is because I am on an NTL 300 Kbps connection
>(approx 33 KBytes/sec) and I notice when I am using P2P software that
>my connection gets fully used up.
>
>At those times my download rate is perhaps 8 KBytes/sec and my upload
>rate is about 8 Kbytes/sec too. These seem very low values. Maybe
>there is a formula I can use?

What's happening is that the ACKs for your incoming TCP traffic can't
make their way to the Internet via your fully utilised upstream. If you
have some way of prioritising the ACKs or throttling back the
application that's generating all the upstream traffic so that there's
enough bandwidth left over for the ACKs, this problem will disappear.

A good router will solve the problem, though I don't know what to
recommend, as what I'm using is rather expensive for home use.



David
--
David Wood
(E-Mail Removed)

On Tue, 10 May 2005 18:27:54 +0100, Mister C
<(E-Mail Removed)> wrote:

>If I use 80% of my upload bandwidth (which I think may be 64 Kbps)
>then does that mean my download bandwidth (which would be 300 Kbps)
>is reduced by 80%?

if you want to download 300k it may use up to say 30k of the upload
for acknowledgements etc.

If the upload is fully occupied by something it will inhibit download
rates.

P2P software is designed to use all available bandwisth unless you
tell it to use less

Phil
Tiscali - dialup speeds at Broadband prices :-)

--

On Tue, 10 May 2005 18:27:54 +0100, Mister C
<(E-Mail Removed)> wrote:

>If I use 80% of my upload bandwidth (which I think may be 64 Kbps)
>then does that mean my download bandwidth (which would be 300 Kbps)
>is reduced by 80%?

all traffic is two-way, as each packet sent or recieved requires an
ack packet to be sent the other way. Therefore if you use up too much
of either direction, you may experience slowdown.

>The reason I ask this is because I am on an NTL 300 Kbps connection
>(approx 33 KBytes/sec) and I notice when I am using P2P software that
>my connection gets fully used up.

bear in mind your download rate is someone elses' upload rate.

On Tue, 10 May 2005 18:27:54 +0100, Mister C <(E-Mail Removed)>
wrote:

>If I use 80% of my upload bandwidth (which I think may be 64 Kbps)
>then does that mean my download bandwidth (which would be 300 Kbps)
>is reduced by 80%?
>
>The reason I ask this is because I am on an NTL 300 Kbps connection
>(approx 33 KBytes/sec) and I notice when I am using P2P software that
>my connection gets fully used up.
>
>At those times my download rate is perhaps 8 KBytes/sec and my upload
>rate is about 8 Kbytes/sec too. These seem very low values. Maybe
>there is a formula I can use?

You didn't say which P2P you use?

On Blueyonder, my d/load is 512Kbps but the upload speed for this service is
only 128Kbps (note the small `b') And most ISP's use different download/upload
speeds. Now a 128Kbps will give you an max KBps (note the large `b')
upload speed of 128 x 1000 (bits per second) / 8 = 16KBytes per second. This
is the maxium possible, but allowing for overheads etc, I rarely ever see more
than about a 10/11 KBps upload speed.

It's well known on BYonder, if you're using bittorrent then you've got to
limit the number of connections as the default, will grind your modem/system
to a halt as they try to cope with the growing number of connections from
other peers.

also on bittorrent, your download is proportional to your upload, so with an
upload of about 10KBps you won't see what you think of as your full download
capability.

I have no erperience of other P2P progs, but your prog docs should be able to
explain what the progs capabilities are.

Clansman