[Samba] Speed differences for windows clients

[Philipp Lies]

Your points would be a good explanation if the speed difference would
occur with linux clients as well. But from linux the connection speed is
close to the 1Gbit limit.

Details on the setup: Linux (ubuntu 12.04 lts x64) and Windows (7 x64)
clients are the same machine, just booting a different OS, an have both
a 1Gbit ethernet connection and are separated through a 2x10 Gbit
firewall from the two servers. The fast server has a 1 Gbit network
connection, the slow server 10 Gbit (yes, that's one reason why I'm
confused). The shares of both servers are the same raid file system with
>400MB/s writing speed.
Firewall (iptables) rules are identically on the servers and the
firewall between client and servers.
So I think I removed causes from the hardware and connection side as
much as possible (without rewiring half of my server room).
Since there doesn't seem to be something simple I forgot to check I
think I can live with the slower windows clients.

Thanks!

Am 8/13/2013 4:06 PM, schrieb L.P.H. van Belle:
> can be several things for explain the difference. 
> 
> 1) fragmentation.
> 2) testfile is on server 1 at the beginning of the disk, second server at the end. 
> 3) is the hardware the same, if not, maybe the server nic drivers is better of server 1. 
> 4) are the harddisk the same ? speed (rpm) , throughput? , size? 
> 
> just some things to consider.
> 
> 
>> -----Oorspronkelijk bericht-----
>> Van: philipp.lies at cin.uni-tuebingen.de 
>> [mailto:samba-bounces at lists.samba.org] Namens Philipp Lies
>> Verzonden: dinsdag 13 augustus 2013 14:11
>> Aan: samba at lists.samba.org
>> Onderwerp: Re: [Samba] Speed differences for windows clients
>>
>> Thanks, but here is no socket option set. Here's the smb.conf 
>> w/o shares:
>>
>> [global]
>>       workgroup = XXX
>>       server string = Samba Server Version %v
>>       netbios name = XXX
>>       log file = /var/log/samba/log.%m
>>       max log size = 1000
>>       syslog = 0
>>
>>       security = user
>>       passdb backend = ldapsam:ldap://localhost
>>       ldap suffix = dc=...
>>       ldap admin dn = cn=...
>>       ldap user suffix = ou=users
>>       ldap group suffix = ou=groups
>>       ldap machine suffix = ou=computers
>>       ldap passwd sync = No
>>       ldap ssl = start tls
>>       domain master = no
>>       domain logons = yes
>>       preferred master = yes
>>       os level = 35
>>
>> Pretty minimal, that's why I thought maybe someone here knows if I
>> should set some additional parameter.
>>
>> Am 8/13/2013 2:07 PM, schrieb Ricky Nance:
>>> If you have a socket options line in your config, comment it out and
>>> restart smbd and see if that helps.
>>> On Aug 13, 2013 4:17 AM, "Philipp Lies" 
>> <philipp.lies at cin.uni-tuebingen.de>
>>> wrote:
>>>
>>>> Am 8/13/2013 10:50 AM, schrieb L.P.H. van Belle:
>>>>> Try the following.
>>>>> Since Win7 does traffic shaping.
>>>>>
>>>>> in adminstrative dos box.
>>>>> run
>>>>> netsh interface tcp set global autotuning=disabled
>>>>>
>>>>> ( the original setting is : netsh interface tcp set global
>>>> autotuningl=normal  )
>>>>> and test again.
>>>> Thanks, this boosted the speed ~5MB/s for both connections but the
>>>> difference between server 1 and server 2 is still at ~10-15 
>> MB/s. It's
>>>> nothing critical, I'm just curious what could cause this.
>>>>
>>>> Cheers
>>>>
>>>> Philipp
>>>>
>>>>>
>>>>>
>>>>> Gr.
>>>>>
>>>>> Louis
>>>>>
>>>>>
>>>>>> -----Oorspronkelijk bericht-----
>>>>>> Van: jra at samba.org [mailto:samba-bounces at lists.samba.org]
>>>>>> Namens Jeremy Allison
>>>>>> Verzonden: dinsdag 13 augustus 2013 2:18
>>>>>> Aan: Philipp Lies
>>>>>> CC: samba at lists.samba.org
>>>>>> Onderwerp: Re: [Samba] Speed differences for windows clients
>>>>>>
>>>>>> On Mon, Aug 12, 2013 at 10:00:18AM +0200, Philipp Lies wrote:
>>>>>>> Hi,
>>>>>>>
>>>>>>> we have a strange phenomenon with the transfer speed 
>> between windows
>>>>>>> clients and samba servers. Here's the setup:
>>>>>>>
>>>>>>> server 1: centos 6.3 with samba 3.5.10
>>>>>>> server 2: centos 6.4 with samba 3.6.9
>>>>>>> both servers are configured as BDC and have - aside from netbios
>>>>>>> name - identical smb.conf which contains ldapsam as 
>> backend and all
>>>>>>> other parameters are not set (i.e. default)
>>>>>>>
>>>>>>> When I mount a share from a linux client, the transfer speed is
>>>>>>> ~112MB/sec to either server from any linux client. 
>> However, when I
>>>>>>> mount a share from Windows clients, the speed to server 
>> 1 is ~95MB/s
>>>>>>> and to server 2 ~85MB/s. We tested this with several 
>> windows clients
>>>>>>> (all running Windows 7 with all updates).
>>>>>>>
>>>>>>> The speed difference between linux client and windows 
>> client is not
>>>>>>> what's confusing me but that server 2 is always slower 
>> than server
>>>>>>> 1.
>>>>>>>
>>>>>>> Any ideas what could cause this?
>>>>>>
>>>>>> Nope. Need more data :-).
>>>>>>
>>>>>> Jeremy.
>>>>>> --
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>>>>>>
>>>>>>
>>>>>
>>>>
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>>>
>>
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>>
>