Samba Performance Woes

I just spent a couple of frustrating days (are there any other kind?) troubleshooting a Samba performance problem on our new Linux server (kernel 2.6.21.5).  Network I/O between our XP machines and the server was SSLLOOWW!!  After much tearing of hair and gnashing of teeth, it turns out that the drivers for the onboard ethernet controller (Realtek 8168B 1GB ethernet) are buggy.  Some fairly exhaustive searches with Google failed to turn up any patches that were reported to work, so I disabled the onboard controller and stuck in an old 3Com 905B that I had in an old machine.  Presto, everything started to work just as it should.

Some fun we’re having.

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