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Date:      Sun, 15 Sep 2002 09:29:54 -0400
From:      Bill Moran <wmoran@potentialtech.com>
To:        Michael Ritchie <michaeljritchie@bigpond.com>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: SAMBA throughput increases when NIC bandwidth is decreased
Message-ID:  <3D848B52.3060108@potentialtech.com>
References:  <5.1.1.6.0.20020915183202.00b94808@mail.bigpond.com>

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Michael Ritchie wrote:
> I am running SAMBA 2.24 on a FreeBSD 4.6.2 box, a 1GHz PIII with 256MB 
> RAM and a nice big, fast scsi hard drive.  My problem is that I cannot 
> get a decent amount of bandwidth out of it.  I have tried adjusting the 
> smb.conf file, based on SPEED.TXT, but I still cannot draw more than 300 
> or 400 k bytes/second out of it.  I tried scaling its ethernet switch 
> port down from 100MBPS full duplex to 10half, and the speed more than 
> tripled -- up to 1200 kbytes / second.  I can't explain this --- help??  
> I have also tried a variety of NICs, from 3com etherlink 905b to Intel 
> EtherExpress Pro100 and a D-Link card.  All exhibit similar behaviour, 
> although not to the extent of the 3com.

Sounds like a problem with the switch and/or autonegotiation.
Set the switch back to 100mbs and check "ifconfig" on FreeBSD to ensure
it is negotiating the correct speed/duplex.  You may have to manually
set it if it doesn't detect correctly.  Bunged autonegotiation will cause
lousy speeds.
Verify that your wiring is up to spec!  Out of spec wiring will cause
higher speed transmission to have lots of problems.
If all else fails, try a different port on the switch and see if the
problem disappears.  If that fails, try a different switch.

-- 
Bill Moran
Potential Technologies
http://www.potentialtech.com


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