samba - Mar 2014 - Abysmal performance with Samba 4 and Windows Explorer

I'm experiencing extremely slow performance when trying to copy files from
and to a samba 4 share. I'm using Debian and the Samba 4 SerNet packages
and everything is up to date on the client as well as on the server. The
connection is made through 100Mbp/s ethernet, but the problem also exists
on a local virtual machine that runs on the Debian server.

By extremely I mean really abysmal:

* Copying a folder with 50 files total size 10 MB to Win7: ~ 20 minutes at
3-4 Kb/s
* Copying the same folder to Windows Server 2003: ~ 3 seconds
* Copying the same folder with ROBOCOPY to Win 7: ~3 seconds
* Copying a large random file 500 MB to Win 7: Takes ages to start copy
progress than up to 10 MB/s
* Copying the same large file to Windows Server 2003: Starts immediately to
copy and takes a few seconds
* Copying the same large file with ROBOCOPY using Win7: also decent
performance, no delays

I already googled for days and found a lot of suggestions to:

* Changes switches: one of the test machines runs as VM on host, so this is
not the issue
* Update network drivers: same thing, using different machines and a VM the
problem exists on all of them
* Turn off Remote Differential compression on the client: Didn't help at all
* Disable autotuning on the client with netsh: Didn't help at all
* Make sure not to use mapped drives but UNC paths instead: Did help when
logging in but has no effect on file transfer
* Try switching max protocol on the samba server to something like NT1: did
not help
* Do not use any other custom smb.conf options like socket etc.

What is the big difference between using Windows File Explorer and
Robocopy? I mean, I cant force my users to copy files with robocopy from
now on.... grml...

Thanks for help!

Hi,

Could you post your smb.conf? Our production Samba 4 servers work a
treat but our older Samba 3 servers had this issue occasionally.
Is there also any error messages in your logging directory?

Thanks,
Marty Sweet

On 5 March 2014 09:26, Simon Schneider <schneida.simon at gmail.com>
wrote:
> I'm experiencing extremely slow performance when trying to copy files
from
> and to a samba 4 share. I'm using Debian and the Samba 4 SerNet
packages
> and everything is up to date on the client as well as on the server. The
> connection is made through 100Mbp/s ethernet, but the problem also exists
> on a local virtual machine that runs on the Debian server.
>
> By extremely I mean really abysmal:
>
> * Copying a folder with 50 files total size 10 MB to Win7: ~ 20 minutes at
> 3-4 Kb/s
> * Copying the same folder to Windows Server 2003: ~ 3 seconds
> * Copying the same folder with ROBOCOPY to Win 7: ~3 seconds
> * Copying a large random file 500 MB to Win 7: Takes ages to start copy
> progress than up to 10 MB/s
> * Copying the same large file to Windows Server 2003: Starts immediately to
> copy and takes a few seconds
> * Copying the same large file with ROBOCOPY using Win7: also decent
> performance, no delays
>
> I already googled for days and found a lot of suggestions to:
>
> * Changes switches: one of the test machines runs as VM on host, so this is
> not the issue
> * Update network drivers: same thing, using different machines and a VM the
> problem exists on all of them
> * Turn off Remote Differential compression on the client: Didn't help
at all
> * Disable autotuning on the client with netsh: Didn't help at all
> * Make sure not to use mapped drives but UNC paths instead: Did help when
> logging in but has no effect on file transfer
> * Try switching max protocol on the samba server to something like NT1: did
> not help
> * Do not use any other custom smb.conf options like socket etc.
>
> What is the big difference between using Windows File Explorer and
> Robocopy? I mean, I cant force my users to copy files with robocopy from
> now on.... grml...
>
> Thanks for help!
> --
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