samba - Aug 2017 - extremely low performance on Samba 4.2.14-Debian

Hai, 

Ok, so you have 3 the same machines and only one is slow. Thats important info. 
Did anything special happen with this server. 
For example 2 servers got a new install and this one had an upgrade (or sort of
upgrade) from the "old" server?

Or you configured the new server in an other (ad site) and moved it to the new
location.
In tring to figure out, where what happend, so we can review these steps and
point of pitfalls.

Can you describe the steps you took when you 
- installed a the "problem" new server.
- how you upgraded and/or installed new. 
- was the server move from site to other site ( ! In the AD ) 
- did it have an ip number change when you moved it to the other site.
- did you make backups on the old and restored them on the new? 
( if yes, what and where ) 

You steps, and preffered in order you did them. If you able to recall them all. 
;-)

If you have 3 (exact) the same machines, and all are same hardware. 
Then or one has failing hardware, or something got corrupted. 

So any info can help more. 

Greetz, 

Louis



> -----Oorspronkelijk bericht-----
> Van: Emmanuel Florac [mailto:eflorac at intellique.com] 
> Verzonden: donderdag 17 augustus 2017 14:01
> Aan: L.P.H. van Belle via samba
> CC: L.P.H. van Belle
> Onderwerp: Re: [Samba] extremely low performance on Samba 
> 4.2.14-Debian
> 
> Le Wed, 16 Aug 2017 23:28:08 +0200
> "L.P.H. van Belle via samba" <samba at lists.samba.org>
écrivait:
> 
> > > Bios raid/hdds/mainboard up to date, so changelog review 
> cant harm. 
> > > Is the nic using firmware?
> > > The output of :   
> > ethtool -i
> > 
> > So few thing, i can think of i would check. 
> > Its a pain, special when its far, the samba options are thing you 
> > might be able to remotely check. Maybe it helps a bit.
> > 
> 
> I've checked everything round and round. Speed is normal with 
> FTP, but not with Samba (I have no other Linux machine on the 
> network to test NFS). iperf3 proves that the NICs perform 
> normally. I've tested several kernels, 2 different NICs 
> (Silicom 40G and Myri 10G), same low samba performance. 
> 
> I've built 3 machines on the same configuration (same RAID 
> controller, Myri 10G nics, Xeon 6420, 64 GB RAM, same mobo, 
> etc) and only this one is so slow. But only with Samba, 
> everything else performs normally.
> 
> It's really crazy.
> 
> --
> --------------------------------------------------------------
> ----------
> Emmanuel Florac     |   Direction technique
>                     |   Intellique
>                     |	<eflorac at intellique.com>
>                     |   +33 1 78 94 84 02
> --------------------------------------------------------------
> ----------
>

Le Thu, 17 Aug 2017 14:37:58 +0200
"L.P.H. van Belle via samba" <samba at lists.samba.org>
écrivait:
> If you have 3 (exact) the same machines, and all are same hardware. 
> Then or one has failing hardware, or something got corrupted. 
> 
> So any info can help more. 
> 
These are 3 systems installed at 3 different locations in different,
but built from the same parts and running the same Debian OS (8.x).
Each one is on a different network, etc. But similar machines have
similar performance, up to this time :/

However I've installed several hundred storage servers and that's the
first time I've seen this. I've never ever had this problem of low
performance on 10GigE, and even less of this low performance in CIFS
only, whatever is the samba version. Even back in 3.x days.

-- 
------------------------------------------------------------------------
Emmanuel Florac     |   Direction technique
                    |   Intellique
                    |	<eflorac at intellique.com>
                    |   +33 1 78 94 84 02
------------------------------------------------------------------------
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On Thu, 17 Aug 2017 15:21:52 +0200
Emmanuel Florac via samba <samba at lists.samba.org> wrote:
> Le Thu, 17 Aug 2017 14:37:58 +0200
> "L.P.H. van Belle via samba" <samba at lists.samba.org>
écrivait:
> 
> > If you have 3 (exact) the same machines, and all are same hardware. 
> > Then or one has failing hardware, or something got corrupted. 
> > 
> > So any info can help more. 
> > 
> 
> These are 3 systems installed at 3 different locations in different,
> but built from the same parts and running the same Debian OS (8.x).
> Each one is on a different network, etc. But similar machines have
> similar performance, up to this time :/
> 
> However I've installed several hundred storage servers and that's
the
> first time I've seen this. I've never ever had this problem of low
> performance on 10GigE, and even less of this low performance in CIFS
> only, whatever is the samba version. Even back in 3.x days.
> 
I think what Louis is trying to point out is:

If you build three PCs from the same parts, install the same OS and
then install Samba (setting it up exactly the same on all three) and
then connect it to the same type of network, you should get the same
result when transferring files etc.

If you get a different result on one PC to the other two, then you need
to look at the different PC. Check that the same packages are installed
on all three PCs and configured in exactly the same way. If they are
all the same, check the network, including cables, switches routers etc.
If after doing all this, you still have the problem, then you need to
look very carefully at the PC itself.

Rowland