03-02-2005
Strange IP traffic behavior when using Samba and FTP (Windows/Mac to Linux)
I have set up a samba share on my Linux server. I have a gigabit switch, gigabit NICs in each machine.
I have set up the /etc/samba/smb.conf to support no delay, 8192 send/receive buffers, etc. This helped the rate for Samba go from about 4MB/S to about 10MB/S, but I expect to see about 30MB/S or better when I get done.
FTP performance and Samba performance writing to the Linux box are both at around 9-10MB/Sec, about 1/3 what I would expect, and about 1/3 the speed of a read. On the Linux box is a 7200RPM SATA drive, which is pretty quick, and is using XFS which should handle the large files well which I send.
Now the funny IP networking part of the problem.
When I send via FTP or Samba, I see my activity lights on my switch flicker at about 500ms or so intervals. If I start a second transfer from the same machine, I apparently get full bandwidth, at about 30+MB/Sec overall.
Why would starting a second transfer from the same box to Linux 'Open the gate' as it were?
Thanks in advance,
Rex McDonald
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LEARN ABOUT CENTOS
libsmbclient
LIBSMBCLIENT(7) 7 LIBSMBCLIENT(7)
NAME
libsmbclient - An extension library for browsers and that can be used as a generic browsing API.
SYNOPSIS
Browser URL: smb://[[[domain:]user[:password@]]server[/share[/path[/file]]]] [?options]
DESCRIPTION
This tool is part of the samba(7) suite.
libsmbclient is a library toolset that permits applications to manipulate CIFS/SMB network resources using many of the standards POSIX
functions available for manipulating local UNIX/Linux files. It permits much more than just browsing, files can be opened and read or
written, permissions changed, file times modified, attributes and ACL's can be manipulated, and so on. Of course, its functionality
includes all the capabilities commonly called browsing.
libsmbclient can not be used directly from the command line, instead it provides an extension of the capabilities of tools such as file
managers and browsers. This man page describes the configuration options for this tool so that the user may obtain greatest utility of use.
OPTIONS
What the URLs mean:
smb://
Shows all workgroups or domains that are visible in the network. The behavior matches that of the Microsoft Windows Explorer.
The method of locating the list of workgroups (domains also) varies depending on the setting of the context variable
(context->options.browse_max_lmb_count). It is the responsibility of the application that calls this library to set this to a sensible
value. This is a compile-time option. This value determines the maximum number of local master browsers to query for the list of
workgroups. In order to ensure that the list is complete for those present on the network, all master browsers must be queried. If
there are a large number of workgroups on the network, the time spent querying will be significant. For small networks (just a few
workgroups), it is suggested to set this value to 0, instructing libsmbclient to query all local master browsers. In an environment
that has many workgroups a more reasonable setting may be around 3.
smb://name/
This command causes libsmbclient to perform a name look-up. If the NAME<1D> or NAME<1B> exists (workgroup name), libsmbclient will list
all servers in the workgroup (or domain). Otherwise, a name look-up for the NAME<20> (machine name) will be performed, and the list of
shared resources on the server will be displayed.
When libsmbclient is invoked by an application it searches for a directory called .smb in the $HOME directory that is specified in the
users shell environment. It then searches for a file called smb.conf which, if present, will fully over-ride the system /etc/samba/smb.conf
file. If instead libsmbclient finds a file called ~/.smb/smb.conf.append, it will read the system /etc/samba/smb.conf and then append the
contents of the ~/.smb/smb.conf.append to it.
libsmbclient will check the users shell environment for the USER parameter and will use its value when if the user parameter was not
included in the URL.
PROGRAMMERS GUIDE
Watch this space for future updates.
VERSION
This man page is correct for version 3 of the Samba suite.
AUTHOR
The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by the Samba Team as an Open
Source project similar to the way the Linux kernel is developed.
The libsmbclient manpage page was written by John H Terpstra.
Samba 4.0 06/17/2014 LIBSMBCLIENT(7)