On Fri, Jun 04, 1999 at 04:04:29PM -0300, Thomas T. Soares wrote:
> Hi there...
>
> Could anyone tell me what should be the transfer rate if I am
> downloading
> a compressed file (gzip -9) is I am connected as 31200 bps?
>
> I am getting about 3.6Kb/s but not sure if this is the best I can do
> and the ppp_deflate seems do no difference at all...
The data you are transfering is already of maximum entropy
kind, and that can't be compressed, no matter what.
TCP+IP frames are 40 bytes out of each 1500 bytes, or 2.7%,
and while those are compressible (possibly), compressing
already compressed data is bound to give fits to the adaptation
algorithm, and may cause it in the end just to send the raw
datablocks wrapped into some kind of frames taking up *more*
space, than the original data -- not much, but some..
You might get a bit better total throughput as calculated
per bytes of uncompressed file by using "bzip2 -9", and run
the link at modem level WITHOUT compression, like also at
the PPP level without compression! You *might* consider
use of VJ-header-compression, though.
All this sounds so counter-intuitive, does it not ?
> Thank you.
> --
> |Porto Alegre| Thomas Tschoepke Soares | // Mate do
> | RS - Brasil| [EMAIL PROTECTED] |(~~~//'~) estrivo
-------------------------------
whether u download or upload a file has nothing to do with the speed
it all depends on the speed both ur machine and ur server ( the client and
the server in the ppp paradigm ) have
which ever is lower is taken
for eg if u have a 33.6 modem but conf it to recv only at 1200 then u will
get 1200 bks and not 33.6 kpbs even if ur server was conf'ed to provide a
better speed
and the same is applicable the other way around
i had a 33.6 download with 33.6 modems both sides downloading gzip files
Mohammed Akram Ali Mehkri
System Administrator Saehan India
Webmaster www.prizeclub.com
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