Very slow accessing network drive to 2003 server from Windows XP Pro SP3, fast from Win 2k

[Chris]

We have an application that performs very poorly on Windows XP when it's
on a 100mbit network connection. The same application performs great on
Windows 2000 with a 100mbit network connection. If I put the XP station
on a gigabit connection it performs well, but I don't have enough
gigabit ports.

I did a packet capture during the issue on both 100mbit and gigabit. In
the 100mbit capture there were a whole bunch of:
SMB:C; Nt Transact, NT NOTIFY_CHANGE, FID = 0x8009 (NULL@#139)
SMB:R; Nt Transact, NT NOTIFY_CHANGE, FID = 0x8009 (NULL@#139)

These were not present in the capture when connected via gigabit ethernet.

I've attached a text file with that portion of the packet capture.

I found this KB article, which looked like it related to my issue:

Windows XP May Cause Extra SMB Notify Change Traffic
http://support.microsoft.com/kb/330929

I made the changes to the registry, but it did not help.

The client is Win XP Pro SP3, server is Win 2003 32-bit Standard SP1.
They are both on the same subnet and no routing is involved.

Please help!

-Chris

[Chris]

Just found that if I disable "Interrupt Moderation" on the network
adapter it resolves the issue.

With Interrupt Moderation on, I would get 4% network bandwidth. Turning
it off made it jump to 30%. Seems good now.

Thanks,
Chris