[Samba] single stream performance issue, Win2K, WinXP, Samba 3.2.5-4lenny7 (Debian Lenny)

Volker Lendecke Volker.Lendecke at SerNet.DE
Mon Jan 25 00:28:38 MST 2010

On Mon, Jan 25, 2010 at 12:14:36AM -0600, Stan Hoeppner wrote:
> Volker Lendecke put forth on 1/24/2010 6:51 AM:
> > On Sun, Jan 24, 2010 at 02:09:51PM +0200, Michael Wood wrote:
> >> Except that he said "I can copy files between the Win2K and WinXP
> >> machines at just over 10MB/s in a single stream and max out the 11MB/s
> >> with two streams."  I am assuming he used the same client in that test
> >> as he did with the test against Samba.  So from what he's said it
> >> seems that he gets more speed with a Windows server than with Samba
> >> for the same client.
> > 
> > So what we need is a full network trace of both cases.
> Actually I'll give you something slightly different, and more to the original
> question.  I've taken two tcp captures on the Samba server machine.  Both
> transfers were performed using the Windows 2000 cli "copy" command pulling a
> 36MB avi file from a share on the Samba server.  The first test was a single
> stream copy.  The second test was a dual stream copy of the same file
> concurrently to two different destination directories.  I also had iftop running
> during the tests.  The single stream transfer maxed out at just over 64Mb/s.
> The dual stream test maxed out at 92Mb/s.  Following are the two tcpdump output
> files using "tcpdump -p -s 0 -w FILE port 445":
> http://www.hardwarefreak.com/smb_single_stream
> http://www.hardwarefreak.com/smb_dual_stream

The dual-stream one is kindof limited help. The interesting
piece is how Win->Win does its thing faster, so we need to
see that one.

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