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Full Discussion: Strange IP traffic behavior when using Samba and FTP (Windows/Mac to Linux)
Top Forums UNIX for Advanced & Expert Users Strange IP traffic behavior when using Samba and FTP (Windows/Mac to Linux) Post 64913 by perspectx on Wednesday 2nd of March 2005 04:45:15 PM
Old 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 REDHAT

smbstatus

SMBSTATUS(1)															      SMBSTATUS(1)

NAME

       smbstatus - report on current Samba connections

SYNOPSIS

       smbstatus [ -P ]  [ -b ]  [ -d ]  [ -L ]  [ -p ]  [ -S ]  [ -s <configuration file> ]  [ -u <username> ]

DESCRIPTION

       This tool is part of the  Samba suite.

       smbstatus is a very simple program to list the current Samba connections.

OPTIONS

       -P     If samba has been compiled with the profiling option, print only the contents of the profiling shared memory area.

       -b     gives brief output.

       -d     gives verbose output.

       -L     causes smbstatus to only list locks.

       -p     print a list of  smbd(8) processes and exit.  Useful for scripting.

       -S     causes smbstatus to only list shares.

       -s <configuration file>
	      The default configuration file name is determined at compile time. The file specified contains the configuration details required by
	      the server. See smb.conf(5)
	       for more information.

       -u <username>
	      selects information relevant to username only.

VERSION

       This man page is correct for version 2.2 of the Samba suite.

SEE ALSO

       smbd(8) and smb.conf(5)

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  original  Samba  man  pages were written by Karl Auer.  The man page sources were converted to YODL format (another excellent piece of
       Open Source software, available at ftp://ftp.icce.rug.nl/pub/unix/ <URL:ftp://ftp.icce.rug.nl/pub/unix/>) and updated  for  the	Samba  2.0
       release by Jeremy Allison. The conversion to DocBook for Samba 2.2 was done by Gerald Carter

								 19 November 2002						      SMBSTATUS(1)
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