Ubuntu Server 8.04 Slow File Uploads

( ``-_-´´ ) -- Fernando ubuntu at bugabundo.net
Sun Jun 29 23:20:32 BST 2008


Olá Tortise e a todos.

On Thursday 26 June 2008 06:14:15 Tortise wrote:
> Hi
> 
> I have two servers and an XP notebook all on same Gig LAN, one an old Celeron 466 / Debian.
> 
> From Windows XP / Dual Pentium notebook can transfer a 1 Meg binary file in the blink of an eye onto Debian. (Less than a second)
> 
> Have made a new Ubuntu Server 8.04, AMD 500 II, setup SSH, log in using SFTP (Same PC, same WinSCP settings etc!) same file takes 10 
> mins!!! Can download file off new server (once its there!) in a flash, so server NIC seems OK.
> 
> I installed using apt-get install ssh openssh-server
> 
> Was using WinSCP 406, upgraded to 407, same, upgraded 413, still same! The /etc/ssh/sshd_config files on the respective machines are 
> largely identical, apart from upgrade(?) syntax changes. Protocol is SFTP(SCP), no key file, SSH protocl Ver 2. (Same for each shown 
> with saved hovertip)
> 
> Checking further both CPU's utilization are minimally touched by this, using task manager and top.
> 
> I also note the Ubuntu server transfers seem to hang with the transfer window frequently unresponsive, yet updated every multiple of 
> seconds. They start off reporting very fast transfers (as expected) with typ speeds of 50,000B/s
> 
> Thinking it may be WinSCP I tried tunnelier, with the same results!
> 
> Suggests something about ubuntu server?, perhaps setup, perhaps someone here can suggest please?
> 
> The Tortise.

SSH tends to have an huge impact on a CPU. so its strange that u dont see any usage.
you may check LP to see if there are any bugs against SSH server.

maybe there is something with the new ssh blacklist modules...

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