[Samba] Slow Samba transfer

[Mauro Condarelli]

Il 14/02/2014 09:50, L.P.H. van Belle ha scritto:
> also,
>
> what i forgot, om only getting the 110Mb/s + because of format.
> I formatted with 4Mb block size, since this is a Movie share on my server.
> the "normal" music share are 1Mb blocks formated.  ( about 80-100Mb/s )
> all my other default.  ( variable from about 60-100Mb/s )
>
> and on debian you can do a  apt-get install iotop
> and type iotop, to see you read/write speeds on the server and which apps are working.

iotop gives higly variable values, but they are consistent with transfer 
speed: 200..1100 Kb/s

If I am not using Samba, but simply read a big file (cp file /dev/null) 
I get 70Mb/s.
Still slow, but two orders of magnitude better!

>
> Louis
>
>> -----Oorspronkelijk bericht-----
>> Van: dcmwai at gmail.com [mailto:samba-bounces at lists.samba.org]
>> Namens Chan Min Wai
>> Verzonden: vrijdag 14 februari 2014 9:37
>> Aan: Mauro Condarelli
>> CC: samba at lists.samba.org
>> Onderwerp: Re: [Samba] Slow Samba transfer
>>
>> Dear Mauro,
>>
>> if you are using the latest version on samba 3.x and above (as
>> I can recall)
>> I would advise you to drop all the socket options and etc...
>>
>>
>> The new version of samba with the new linux kernel are able to
>> adjust that
>> without much adjustment...
>>
>> However, since your are behind the vm...
>> you might want to try a small fio test to see if the limit was
>> vm or etc...
>>
>> http://www.linux.com/learn/tutorials/442451-inspecting-disk-io-
>> performance-with-fio
>>
>> Hope this help...
>>
>>
>> On Fri, Feb 14, 2014 at 7:51 AM, Mauro Condarelli
>> <mc5686 at mclink.it> wrote:
>>
>>> Hi,
>>> this is my first pos here, please be lenient.
>>> My problem shuld be a FAQ and, in fact I found a lot of references
>>> googling around, but nothing could really solve my problem,
>> so here I am.
>>>
>>> I have a Samba server:
>>> Very basic wheezy amd64 installation on a small VIRTUAL server (Xen).
>>> Only fancy thing is direct access to a couple of RAID1
>> (mirror) arrays
>>> where data is stored.
>>>
>>> I normally access data from Windows (mostly Seven) machines connected
>>> either via ethernet GB hub (but some machines are 100MB) or
>> via WLan(N).
>>>
>>> Problem is throughput is generally low (about 1 mb/s) and,
>> for really big
>>> files (> 1Gb) it drops with time going to the range of few
>> hunderd kb/s.
>>>
>>> Transferring a 4Gb file takes HOURS.
>>>
>>> I do not believe it's normal, is it?
>>>
>>> I started with the plain wheezy-provided setup and tried to
>> improve it
>>> following several advices found around the net, but I did not see any
>>> difference.
>>>
>>> Things I tried are:
>>>
>>>     strict allocate = yes
>>>     read raw = yes
>>>     write raw = yes
>>>     strict locking = no
>>>     socket options = TCP_NODELAY IPTOS_LOWDELAY SO_RCVBUF=65536
>>> SO_SNDBUF=65536 SO_KEEPALIVE
>>>     min receivefile size = 16384
>>>     use sendfile = true
>>>     aio read size = 1
>>>     aio write size = 1
>>> ;   vfs objects = aio_fork
>>>
>>> in various combinations.
>>> Last option does not seem to be supported in Wheezy:
>>>
>>> [2014/02/14 00:47:09.185334,  0] smbd/vfs.c:173(vfs_init_custom)
>>>    error probing vfs module 'aio_fork': NT_STATUS_UNSUCCESSFUL
>>> [2014/02/14 00:47:09.185397,  0] smbd/vfs.c:315(smbd_vfs_init)
>>>    smbd_vfs_init: vfs_init_custom failed for aio_fork
>>> [2014/02/14 00:47:09.185440,  0]
>> smbd/service.c:902(make_connection_snum)
>>>    vfs_init failed for service IPC$
>>>
>>>
>>> What should I do?
>>> Thanks in Advance
>>> Mauro
>>>
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>>
>