Date: Tue, 9 Feb 2010 19:35:53 -0800 (PST) From: Richard Mahlerwein <mahlerrd@yahoo.com> To: Anton Shterenlikht <mexas@bristol.ac.uk>, Vincent Hoffman <vince@unsane.co.uk> Cc: freebsd-questions@freebsd.org Subject: Re: sftp from home wireless box to work - get is much faster that put Message-ID: <8356.477.qm@web51007.mail.re2.yahoo.com> In-Reply-To: <20100209233825.GG41851@mech-cluster241.men.bris.ac.uk> References: <20100209231601.GF41851@mech-cluster241.men.bris.ac.uk> <4B71EEC0.1030201@unsane.co.uk> <20100209233825.GG41851@mech-cluster241.men.bris.ac.uk>
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>From: Anton Shterenlikht <mexas@bristol.ac.uk>
>To: Vincent Hoffman <vince@unsane.co.uk>
>Cc: freebsd-questions@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.
[snip]
>> > At home I've wireless, TL-WN851N, using ath(4) driver.
[snip]
>> > 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
>anton
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
sftp>
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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