Re: Slow initial TCP connection to any machine.

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

From: Phillip Windell (_at_.)
Date: 06/30/04 

Date: Wed, 30 Jun 2004 16:41:46 -0500

Assuming the Domain Controllers are Server2000:

321169 - Slow SMB Performance When You Copy Files from Windows XP to a
Windows 2000 Domain
http://support.microsoft.com/?id=321169 

-- 
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com
"Aquasapien" <chris.dees@wallst.com> wrote in message
news:9be97158.0406301325.1d450cd7@posting.google.com...
> We are affiliated with the Financial Industry, so obviously, one of
> our many concerns is our network performance. We are rolling out new
> HP XPPro workstations. One of our Developers noted that a code
> updating tool we built was taking a total of 10-20 times longer to
> update all the servers in a pool from his new machine compared to old
> (Win XP vs Win2K). This tool basically does a series of file transfers
> and updates several SQL servers.
> To look for an explanation, he used a small utility that can send a
> series of identical dummy files to another host and time how long each
> one takes. With this tool, we typically see a transfer time of about
> 35ms for each 100k file. However, from any of the XP workstations, the
> first connection/transfer takes about 1 full second, and the
> subsequent ones are taking the usual 30ms - 40ms. We need to find out
> why this is happening on the XP machines, because these update are now
> taking a very long time to complete when multiplied by the number of
> machines we have. We cannot duplicate this behavior on any of the 600+
> Win2K machines we have (all of the transfers are the same).
> I've tried 3 different NICs, tried every combination of settings for
> the NICs (duplex, buffers, etc.). I finally set up a packet sniffer to
> find out what seems to be causing the problem and it looks like that
> inial connection is getting 3 TCP RSTs in a row from the target
> machine in response to the incoming SYN from the XP box. Each RST is
> taking about 300-400ms finish before the next SYN attempt, for a total
> of 1 second (as mentioned above). Has anyone seen ANYTHING related to
> this behavior? If I was to contact Microsft for technical assisance,
> any hints as to how to get this escalated to the proper level with a
> minimum of hassle? Thanks in advance.

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