samba - Jul 2014 - Fwd: SMB question

Hi, I sent you an email but now when I read it again, it looks like there
were some mistakes in it... Please ignore that and address only the
following message:


Hi,
I don't know if this is the right place to ask, but I really couldn't
find
it anywhere on the web and if you could only provide me with a quick hint,
it would be really helpful!

I'm experiencing the following problem with the SMB file share protocol:
1. User1 logs into windows.
2. User1 loads a file (from a network share) and works on it
3. User2 logs into windows on a different machine.
4. User2 loads the same file (from the same location on network) but the
loading of the file is much much slower. When check the network traffic for
User2 during the loading of the file (using WireShark) I can see that the
file is devided into much smaller packets than it was when User1 loaded it.
This behaviour is reproducable 80% of the times.

User1 ALWAYS gets the file much faster than User2 and the packet sizes for
the file when User1 downloads it are ALWAY larger, my assumption is that
this is what causing the slow transfer.

My question is, does it make sense that the file would be devided into much
smaller packets when a second user accesses it over network?
If you, do you have a recommendation how I can improve this behaviour to
make User2 get the file just as fast as User1?

Again, any hint woul dbe greatly valued... Thanks a lot for taking the time
to read my email!


---------- Forwarded message ----------
From: Uri Abramson <abramson.uri at gmail.com>
Date: Tue, Jul 29, 2014 at 2:11 PM
Subject: SMB question
To: jra at samba.org


Hi,
I don't know if this is the right place to ask, but I really couldn't
find
it anywhere on the web and if you could only provide me with a quick hint,
it would be really helpful!

I'm experiencing the following problem with the SMB file share protocol:
1. User1 logs into windows.
2. User1 loads a file (from a network share) and works on it
3. User2 logs into windows on a different machine.
4. User2 loads the same file (from the same location on network) but the
loading of the file is much much slower. When checking it using WireShark,
I can see that the packets transfered are devided into much small pieces
that the file was devided into when loaded by User1.

Do you have any idea what this could be? again, any hint woul dbe greatly
valued... thanks!

On Wed, 2014-07-30 at 09:41 +0000, Uri Abramson wrote:
>  do you have a recommendation how I can improve this behaviour to
> make User2 get the file just as fast as User1?
Hi
The easiest way is to make the file read only.
Steve

Hi!

Search the net for "SMB oplocks". User2 does not get one, so
it uses smaller chunks.

Volker

On Wed, Jul 30, 2014 at 09:41:33AM +0000, Uri Abramson
wrote:
> Hi, I sent you an email but now when I read it again, it looks like there
> were some mistakes in it... Please ignore that and address only the
> following message:
> 
> 
> Hi,
> I don't know if this is the right place to ask, but I really
couldn't find
> it anywhere on the web and if you could only provide me with a quick hint,
> it would be really helpful!
> 
> I'm experiencing the following problem with the SMB file share
protocol:
> 1. User1 logs into windows.
> 2. User1 loads a file (from a network share) and works on it
> 3. User2 logs into windows on a different machine.
> 4. User2 loads the same file (from the same location on network) but the
> loading of the file is much much slower. When check the network traffic for
> User2 during the loading of the file (using WireShark) I can see that the
> file is devided into much smaller packets than it was when User1 loaded it.
> This behaviour is reproducable 80% of the times.
> 
> User1 ALWAYS gets the file much faster than User2 and the packet sizes for
> the file when User1 downloads it are ALWAY larger, my assumption is that
> this is what causing the slow transfer.
> 
> My question is, does it make sense that the file would be devided into much
> smaller packets when a second user accesses it over network?
> If you, do you have a recommendation how I can improve this behaviour to
> make User2 get the file just as fast as User1?
> 
> Again, any hint woul dbe greatly valued... Thanks a lot for taking the time
> to read my email!
> 
> 
> ---------- Forwarded message ----------
> From: Uri Abramson <abramson.uri at gmail.com>
> Date: Tue, Jul 29, 2014 at 2:11 PM
> Subject: SMB question
> To: jra at samba.org
> 
> 
> Hi,
> I don't know if this is the right place to ask, but I really
couldn't find
> it anywhere on the web and if you could only provide me with a quick hint,
> it would be really helpful!
> 
> I'm experiencing the following problem with the SMB file share
protocol:
> 1. User1 logs into windows.
> 2. User1 loads a file (from a network share) and works on it
> 3. User2 logs into windows on a different machine.
> 4. User2 loads the same file (from the same location on network) but the
> loading of the file is much much slower. When checking it using WireShark,
> I can see that the packets transfered are devided into much small pieces
> that the file was devided into when loaded by User1.
> 
> Do you have any idea what this could be? again, any hint woul dbe greatly
> valued... thanks!
> -- 
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> instructions:  https://lists.samba.org/mailman/options/samba
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