I guess I should take some of my own advice :P
what I *meant* was KBps into Mbps. So if you are downloading at
200KBps then you multiple by 8 to get 1.6Mbps (plus overheads for the
pendants)
Adam.
On 02/01/2007, at 10:11 PM, Stephen Chape wrote:
Huh !!!
I thought 1012 Kb = 1 Mb
So wouldn't you have to multiply by approx 1000 ?
On 02/01/2007, at 2:04 PM, Adam Hewitt wrote:
Firstly your numbers are all kinds of messed up. To change kbps
into Mbps you multiply by 8, not 10, and its Mbps not MBps
(megabits vs megabytes). I guess you are using 10 to take into
account packet headers etc, however you use this conversion when
going from Mbps down, not the other way around.
Without getting into really fine detail there is a limit to the
speed you can get with a single tcp stream. Therefore you really
need to be sending multiple streams in order to receive your full
connection potential. This is the reason why bittorrent works so
well (when there are enough people to download from) because you
are downloading a single item from multiple (sometimes hundreds)
of tcp streams. You can increase the amount possbile in a single
stream by modifying your TCP Window Size however I am not sure how
to do this in OSX
I am on 20Mbps ADSL2+ with iiNet and I have been able to download
at >2MBps (yes MB) using multiple tcp streams over ftp. I could
probably get faster than that by adjusting the tcp window size or
increasing the number of threads, but 2MBps is quick enough for me.
Adam.
On 02/01/2007, at 1:48 PM, Glenn Nicholas wrote:
Hi everyone, happy new year!
Since there have been a number of posts on ADSL recently, thought
I'd post my experience of the Westnet upgraded 8MB service.
I use iiNet ADSL2+ at home (Shenton Park, around 4.5km to
exchange in Subiaco). The peak speed I see *occasionally* is
around 400KB/sec (as reported by Activity Monitor), which is
around 4MB/sec. But more often than not it is between 1-3MB/
sec. I don't keep records, but it does seem that the speed has
been slowing down (ie. less 4Mb peaks, and more often 1.5MB).
At the office (Shenton Park, 4km to Subiaco Exchange), I was on
the 1.5MB Westnet plan, and I used to see 150KB/sec on Activity
Monitor, exactly as expected. I've upgraded to the new 8MB plan
as of 1/1, but am only seeing 160-170KB/sec at peak (ie.
~1.6MB-1.7MB). I've asked Westnet if there is anything I need to
tweak, but suspect it will come down to 'it depends on distance
and link to exchange'. Suggests I either pay extra for
1.6-1.7MB, or downgrade to 1.5MB.
I double checked this using two Australian based speed test
sites, which both confirmed around 1.2MB. The links to the speed
test sites are available on Westnet (go to Help, then How fast is
broadband ADSL).
Would be nice to actually get something faster than 2-3MB. But
not keen on trying Amcom unless there was a good reason to expect
it would be any different.
Regards,
Glenn Nicholas.
PublicityShip
-- The WA Macintosh User Group Mailing List --
Archives - <http://www.wamug.org.au/mailinglist/archives.shtml>
Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml>
Unsubscribe - <mailto:[EMAIL PROTECTED]>
-- The WA Macintosh User Group Mailing List --
Archives - <http://www.wamug.org.au/mailinglist/archives.shtml>
Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml>
Unsubscribe - <mailto:[EMAIL PROTECTED]>
Regards,
Stephen Chape
