sftp from home wireless box to work - get is much faster that put

Richard Mahlerwein mahlerrd at yahoo.com
Wed Feb 10 03:35:55 UTC 2010

>From: Anton Shterenlikht <mexas at bristol.ac.uk>

>To: Vincent Hoffman <vince at unsane.co.uk>
>Cc: freebsd-questions at freebsd.org
>Sent: Tue, February 9, 2010 5:38:25 PM
>Subject: Re: sftp from home wireless box to work - get is much faster that put
>On Tue, Feb 09, 2010 at 11:24:48PM +0000, Vincent Hoffman wrote:
>> On 09/02/2010 23:16, Anton Shterenlikht wrote:
>> > I was trying to measure the file transfer
>> > rates between my home and my office boxes.
>> > Both are 9.0-current.


>> > At home I've wireless, TL-WN851N, using ath(4) driver.


>> > I used sftp(1), which I launch from the home box.
>> > So putting (sending) a file is about 5-17 times faster
>> > than getting (receiving) it.
>> >
>> > What is the reason behind this? 

>> Just a thought, Since you are in the uk, do you have ADSL at home? If so
>> the upload on ADSL is much lower than the download.
>yes, probably. It's a Virgin broadband. I guess it's ADSL.
>Anyway, that's just what I wanted to hear.
>many thanks

Isn't that the wrong way around?  Put some numbers to it and you'll see.
Pretend a 5Mb download and 1 Mb upload at home.  To a faster-than-you
location, you would download at 5Mb, upload at 1Mb.  NOT the other 
way around as the OP mentions.

Now, if your upload was slower, as is mine, a 5 to 1 speed ratio the 
other way isn't a stretch at all.

Here's mine (inexpensive 1 Mb/384Kb ADSL at home to 45 Mb symmetric 
fiber at work)

sftp> put output.txt
Uploading output.txt to /output.txt
output.txt                                    100%   12MB  38.8KB/s   05:15
sftp> get output.txt output.txt2
Fetching /output.txt to output.txt2
/output.txt                                   100%   12MB 102.7KB/s   01:59

38KB/s up, 102 KB/s down. 3 to 1.  

Some cable modems do larger asymmetries, like 5 Mb/256 Kb, and that 
could give you a ratio like that, but only if the work was on
a connection like that and you were on something more symmetric.

17:1 is a bit hard to fathom.  That's some serious asymmetry on the
work end.


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