CentOS - Aug 2009 - Samba "use sendfile" configuration option set do disabled as default - why?

Hello,

I had problems with speed of Samba, so I was looking for some solution
and I had discovered "use sendfile" configuration option. I was
checking all Samba release notes and I had discovered, that from some
version (older than is in CentOS repo) this option was turned on as
default. So my question is, why in CentOS 5.3 is that option in
default set to off?

Thank you for responses
Martin ??astn?

Hi
Have you tried this one? socket options = TCP_NODELAY IPTOS_LOWDELAY
SO_RCVBUF=65536 SO_SNDBUF=65536

Also look at the log level reduce it to level to or lower.

Per

--- Original message follows ---
SUBJECT:?[CentOS] Samba "use sendfile" configuration option set do
disabled as default - why?
FROM: ?happymaster23 
TO:?"CentOS mailing list" 
DATE:?24-08-2009 12:47

Hello,

I had problems with speed of Samba, so I was looking for some
solution
and I had discovered "use sendfile" configuration option. I was
checking all Samba release notes and I had discovered, that from some
version (older than is in CentOS repo) this option was turned on as
default. So my question is, why in CentOS 5.3 is that option in
default set to off?

Thank you for responses
Martin ??astn?
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CentOS at centos.org
http://lists.centos.org/mailman/listinfo/centos
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Am Montag, den 24.08.2009, 13:24 +0200 schrieb Per
Qvindesland:
> socket options = TCP_NODELAY IPTOS_LOWDELAY SO_RCVBUF=65536
> SO_SNDBUF=65536
These options are often found if you search for samba tuning. Did
someone actaully benchmark the results? Shouldn't tuning buffers manuall
be oboslete nowadays? I somewhat doubt this is THE solution for slow
sambas.

Chris


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Hi

I am not saying that this is the solution but I am saying that it
might be worth a short, even if it works for you I would still fine
tune it depending on your configs, a lot of the time fine tuning samba
is a pain and most of the time it actually comes down to crappy
network performance I.E the nic seems to be working but it actually
has a fault.

Regards
Per Qvindesland
--- Original message follows ---
SUBJECT:?Re: [CentOS] Samba "use sendfile" configuration option set
do disabled as default - why?
FROM: ?Christoph Maser 
TO:?"CentOS mailing list" 
DATE:?24-08-2009 13:27

Am Montag, den 24.08.2009, 13:24 +0200 schrieb Per
Qvindesland:
> socket options = TCP_NODELAY IPTOS_LOWDELAY SO_RCVBUF=65536
> SO_SNDBUF=65536
These options are often found if you search for samba tuning. Did
someone actaully benchmark the results? Shouldn't tuning buffers
manuall
be oboslete nowadays? I somewhat doubt this is THE solution for slow
sambas.

Chris

financial.com AG

Munich head office/Hauptsitz M?nchen: Maria-Probst-Str. 19 | 80939
M?nchen | Germany
Frankfurt branch office/Niederlassung Frankfurt: Messeturm |
Friedrich-Ebert-Anlage 49 | 60327 Frankfurt | Germany
Management board/Vorstand: Dr. Steffen Boehnert (CEO/Vorsitzender) |
Dr. Alexis Eisenhofer | Dr. Yann Samson | Matthias Wiederwach
Supervisory board/Aufsichtsrat: Dr. Dr. Ernst zur Linden
(chairman/Vorsitzender)
Register court/Handelsregister: Munich ? HRB 128 972 | Sales tax ID
number/St.Nr.: DE205 370 553
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Thank you for replies,

with option "use sendfile = yes" it works great (with good speed), but
I am asking why is this option in CentOS disabled as default, even in
standard samba build it should be (according to Samba release notes)
enabled as default.

So my question is, why in CentOS?s Samba build is this option as
default disabled. Is it experimental? Is it potentially dangerous?
(Something like oplocks?)

2009/8/24 Per Qvindesland <per at norhex.com>:
> Hi
>
> I am not saying that this is the solution but I am saying that it might be
> worth a short, even if it works for you I would still fine tune it
depending
> on your configs, a lot of the time fine tuning samba is a pain and most of
> the time it actually comes down to crappy network performance I.E the nic
> seems to be working but it actually has a fault.
>
> Regards
> Per Qvindesland
>
> --- Original message follows ---
> Subject:?Re: [CentOS] Samba "use sendfile" configuration option
set do
> disabled as default - why?
> From: ?Christoph Maser <cmr at financial.com>
> To:?"CentOS mailing list" <centos at centos.org>
> Date:?24-08-2009 13:27
>
>
> Am Montag, den 24.08.2009, 13:24 +0200 schrieb Per Qvindesland:
>> socket options = TCP_NODELAY IPTOS_LOWDELAY SO_RCVBUF=65536
>> SO_SNDBUF=65536
>
> These options are often found if you search for samba tuning. Did
> someone actaully benchmark the results? Shouldn't tuning buffers
manuall
> be oboslete nowadays? I somewhat doubt this is THE solution for slow
> sambas.
>
> Chris
>
>
> financial.com AG
>
> Munich head office/Hauptsitz M?nchen: Maria-Probst-Str. 19 | 80939 M?nchen
|
> Germany
> Frankfurt branch office/Niederlassung Frankfurt: Messeturm |
> Friedrich-Ebert-Anlage 49 | 60327 Frankfurt | Germany
> Management board/Vorstand: Dr. Steffen Boehnert (CEO/Vorsitzender) | Dr.
> Alexis Eisenhofer | Dr. Yann Samson | Matthias Wiederwach
> Supervisory board/Aufsichtsrat: Dr. Dr. Ernst zur Linden
> (chairman/Vorsitzender)
> Register court/Handelsregister: Munich ? HRB 128 972 | Sales tax ID
> number/St.Nr.: DE205 370 553
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