Very Computer

by **Bishopmeist** » Mon, 26 Feb 1996 04:00:00

When I connect with a 28.8 modem I can seldom get a ftp transfer rate over 2
Kbs. I know in Windows I can get over 15+Kbs. Is this just how it is or are people getting better returns and I somehow have to tweak my script?

by **Rick Macdouga** » Tue, 27 Feb 1996 04:00:00

: When I connect with a 28.8 modem I can seldom get a ftp transfer rate over 2
: Kbs. I know in Windows I can get over 15+Kbs. Is this just how it is or are people getting better returns and I somehow have to tweak my script?

With a good provider you should get 2.3-2.7 Kps throughput although
your mileage may vary depending on where you are downloading from. With
Windows you are getting 15bps or 1.5kps, if not please send me your Init
String :)

Regards,

rickm

by **Ashok Aiy** » Wed, 28 Feb 1996 04:00:00

> When I connect with a 28.8 modem I can seldom get a ftp transfer rate over 2
> Kbs. I know in Windows I can get over 15+Kbs. Is this just how it is or are

^^^^^^

Quote:> people getting better returns and I somehow have to tweak my script?

Assuming that all other things are equal, i.e you are transferring
the same files under Windows and Linux, may I suggest that the
the Windows transfer rate is "kilo-BITS per second" (particularly
if you are using ws_ftp), while the Linux transfer rate is
"kilo-BYTES per second". There is a difference of 8 in there.

With a decent set of modems on both ends of the link, you should
see about 2.0 - 3.0 kilobytes/sec with files that are compressed
*.gz, *.zip under either Windows or Linux. With text files the
rates will vary considerably depending upon:
a) how compressible the file is (via v.42bis compression)
b) the DTE rate at both ends

Ashok

--
Ashok Aiyar

Univ. of Wisconsin-Madison tel: (608) 262-6697

by **Jim Ru** » Thu, 29 Feb 1996 04:00:00

I think some experimental data is being requested...
For me :
1K/sec average FTP throughput
14.4K modem
serial port set at 19.2K
standard 8250 (?) UART

This configuration is a bit off base from your system, but it
might help.

: >Nope, in this case the difference should still be 8. He is using
: >the same transfer protocol (FTP) over TCP over IP under both
: >operating systems. The only conversion needed is from bits per
: >second to bytes per second.

: >Later,
: >Ashok

: He is speaking about transfer rates while connected via a 28.8 modem.
: If the modem is transferring 28.8 Kbps, he should get 2.88k bytes of
: FTP or any other data assuming no compression by the modem and no
: external protocol overhead.

: Lower rates are possible if the modem detects an error and needs to
: resend a block of data. 28.8 modems are more sensative to noise than
: slower modems so it is very possible to "upgrade" to 28.8 and actually
: get a LOWER throughput that you did with a 14.4 modem due to these
: resends of data on a noisy link.

: George Bonser

: Any operating system without source is a trojan horse.

by **Ashok Aiy** » Fri, 01 Mar 1996 04:00:00

>>Assuming that all other things are equal, i.e you are transferring
>>the same files under Windows and Linux, may I suggest that the
>>the Windows transfer rate is "kilo-BITS per second" (particularly
>>if you are using ws_ftp), while the Linux transfer rate is
>>"kilo-BYTES per second". There is a difference of 8 in there.

>Actually the difference works out closer to 10 if you add the stop bit
>and protocol overhead.

Nope, in this case the difference should still be 8. He is using
the same transfer protocol (FTP) over TCP over IP under both
operating systems. The only conversion needed is from bits per
second to bytes per second.

Later,
Ashok

--
Ashok Aiyar, Ph.D.

Univ. of Wisconsin-Madison tel: (608) 262-6697

by **Mark Bish** » Fri, 01 Mar 1996 04:00:00

>He is speaking about transfer rates while connected via a 28.8 modem.
>If the modem is transferring 28.8 Kbps, he should get 2.88k bytes of
>FTP or any other data assuming no compression by the modem and no
>external protocol overhead.
>Lower rates are possible if the modem detects an error and needs to
>resend a block of data. 28.8 modems are more sensative to noise than
>slower modems so it is very possible to "upgrade" to 28.8 and actually
>get a LOWER throughput that you did with a 14.4 modem due to these
>resends of data on a noisy link.

Hmm...is there any software out there for Linux that will let me see what my actual throughput is then?

by **Remi Guyomar** » Wed, 06 Mar 1996 04:00:00

>>He is speaking about transfer rates while connected via a 28.8 modem.
>>If the modem is transferring 28.8 Kbps, he should get 2.88k bytes of
>>FTP or any other data assuming no compression by the modem and no
>>external protocol overhead.
>>Lower rates are possible if the modem detects an error and needs to
>>resend a block of data. 28.8 modems are more sensative to noise than
>>slower modems so it is very possible to "upgrade" to 28.8 and actually
>>get a LOWER throughput that you did with a 14.4 modem due to these
>>resends of data on a noisy link.
>Hmm...is there any software out there for Linux that will let me see what my actual throughput is then?

Try NcFTP. The latest version is 2.3.0 I think.

----
Remi Guyomarch, Montargis, FRANCE.

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FTp Transfer rates

FTp Transfer rates

FTp Transfer rates

FTp Transfer rates

FTp Transfer rates

FTp Transfer rates

FTp Transfer rates

FTp Transfer rates