Strange VFS performance problem

Andrew Bartlett abartlet at
Thu Feb 10 01:13:58 GMT 2005

On Wed, 2005-02-09 at 16:56 -0800, Terry Griffin wrote:
> Hi all,
> I'm having a very strange Samba VFS performance problem. Hoping
> you can provide some clues.
> I've implemented a custom Samba VFS module. Functionally everything
> is fine and the module does what it's supposed to do.
> With a Windows 2000 client the VFS module introduces an expected
> throughput hit on large writes in the range of 10-20% (over Gigabit
> Ethernet). But with a Linux CIFS client the throughput hit is more
> like 90%!

Another suggestion is to look both at network traces (the different
clients do make very different calls) or to enable one of the audit VFS
modules in the stack above your module, and see what call is being hit.

Andrew Bartlett

Andrew Bartlett                      
Authentication Developer, Samba Team 
Student Network Administrator, Hawker College
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