[Pkg-samba-maint] Bug#538079: (forw) Re: Bug#538079: Bug#538079: samba: Dead Slow READ performance - WRITE Performance OK

[Christian Perrier]

----- Forwarded message from Tobias Göller <tobias at brabbel.ch> -----

Date: Thu, 23 Jul 2009 11:47:38 +0200
From: Tobias Göller <tobias at brabbel.ch>
To: Christian Perrier <bubulle at debian.org>
Subject: Re: Bug#538079: [Pkg-samba-maint] Bug#538079: samba: Dead Slow READ performance - WRITE Performance OK
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X-CRM114-Status: Good  ( pR: 27.0851 )

Hi Christian,

When I found this performance problem I was playing a bit with the
socket options... as you already mentioned: no performance impact what
so ever.

It wasn't there before - I just copy and pased the files into the
mail...

Fun thing is that when I write to the server the performance figures
are very good - up to 500MBit/s over GBit channel - write.

But read (and only read) is dreadfully slow.

I have a switched network (layer 3 switches) and have tried about
everything (duplex, flow-contrl, etc) - without luck so far.

NFS works like a charm (even from my Mac Systems).

CU
Tobias

On 23.07.2009, at 11:44, Christian Perrier wrote:

> Quoting Steve Langasek (vorlon at debian.org):
> 
>> These are all part of the *stock* smb.conf that we ship in Debian
>> and will
>> have no impact on file sharing speed.
> 
> I agree in general but wanted to reduce the investigation as much as
> possible. I don't think that problems come from the smb.conf settings
> (except maybe "socket options").
> 
>>>        socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
>> 
>> This could have a performance impact.
> 
> Agreed. And, according to upstream, there is no reason to use that
> anymore.
> 
> 
>> 
>>>        winbind enum users = Yes
>>>        winbind enum groups = Yes
>> 
>> These could have a performance impact, but should not in the
>> context of file
>> serving.
> 
> 
> Yep. Agreed too.
> 
> 

----- End forwarded message -----

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