[Samba] Transfer speed

[Azerty Ytreza]

Hello,

I have tested with the same version of Samba/Kernel but from a Win7 x64 client.
Transfert speed at 98/99% of bandwidth used  so it's not the server
which have a problem but the client used ! You have right :)
So for the moment, I doesn't change kernel version because I use it
from a Windows 2003 x64 and can't reach better speed.
Windows 2003 x64 seem limited at ~50% of bandwidth at gigabit speed :(

Thank you !
I have understand the gigabit secret and the famous unreachable
gigabit speed now :)

On 4/13/12, Steve French <smfrench at gmail.com> wrote:
> On 03:06:34 wrote Stan Hoeppner:
>> On 4/10/2012 9:36 AM, Volker Lendecke wrote:
>> > On Tue, Apr 10, 2012 at 08:55:14AM -0500, Chris Weiss wrote:
>> >> On Tue, Apr 10, 2012 at 8:53 AM, Volker Lendecke
>> >>
>> >> <Volker.Lendecke at sernet.de> wrote:
>> >>> On Tue, Apr 10, 2012 at 08:26:48AM -0500, Chris Weiss wrote:
>> >>>> that's dramatic!  what needs done (from a user POV) to get this
>> >>>> backported into Stable distro kernels?  suggestions?
>> >>>
>> >>> Wait until the next major releases pick it up.
>> >>
>> >> that's a really crappy option.  in certain cases that
>> >> could be 4 years from now.
>> >
>> > Well, if you are an important enough RH customer you might
>> > be able to apply pressure. But that's a LOT of money
>> > probably. Same for SuSE. Debian will likely be very
>> > resistant against that kind of bribery^Wincentive.
>>
>> Debian already has 3.2.6 available in the stable repo:
>>
>> $ aptitude search linux-image
>> ...
>> i   linux-image-3.2.6           - Linux kernel, version 3.2.6
>> ...
>
> My Fedora is running 3.3 and performance screams
> with reads and writes over cifs, especially to Samba.
>
> At least SuSE and RHEL6.2 appear to have upgraded
> their kernel far enough to get the really fast
> writes over cifs.  Jeff Layton did a good job on these
> performance patches.   Hard to complain about 95%
> network utilization (and it will get even better when
> the SMB2 and SMB2.1 support is merged).
>
> You will be even happier with 3.4 kernel on the client
> because then you can get even more parallelism
> (assuming you have a big set of disks to distribute
> work across on your server) when you set much larger values for
> "max mux" in the server's smb.conf you will be able
> to get up to 32768 requests in parallel queued to Samba.
> With today's networks and Samba the default for servers
> (of 50) is way too low - and with 3.4 kernel cifs client
> we will be able to send even more requests in parallel
> if the server indicates it can support it (more than 50
> maximum multiplex requests).
>
> Note that Linux cifs kernel client always supported great parallelism
> and would easily use most of the network bandwidth if multiple
> processes were doing i/o against multiple files on the same
> mount - but with 3.0 (for sequential write like file copies)
> and later kernels for reads - cifs is VERY fast now.
>
> Prior to 3.0 kernel for fast file copies from Windows
> or Samba servers you can use smbclient (user space tool)
> which due to good work by Volker has had nice performance
> for sequential read/wirte for a few years.
>
>
> --
> Thanks,
>
> Steve
> --
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