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Old 02-16-2012, 08:28 AM   #1
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Registered: Feb 2012
Posts: 2

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Slow transfer using SFTP/SCP

Hello all,

I'm having 6 RH-4.9 servers. On all the boxes I'm having speed problem when using sftp/scp protocol to transfer some files.

When using FTP protocol, the speed is about 80MB/s but when using SFTP/SCP I'm getting a poor 2MB/s.

What I did so far is to disable the sftp subsystem into sshd_config file and restart ssh daemon. After this the speed increase to 8MB/s which is a bit better but still poor.

Many client have been tested and all the results are the same ( filezilla, winscp, pscp, etc ... )

Any hints or similar experience ?

Old 02-17-2012, 01:28 PM   #2
Registered: Jan 2005
Location: Munich, Germany
Distribution: SuSE
Posts: 184

Rep: Reputation: 25
Hi, well, sftp is encrypted, so you should check the CPU load during transfer.
You can test with -c des to switch to an easier (but less secure) encryption.

Also, is it continuously slow, or is only the initial connect slow ?
(i.e. test with a much larger file. does the average speed improve ?)

Also, you could try with ftps.

Cheers, Tom.


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