[Samba] Speed differences for windows clients

[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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