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System seems slow and running NETPERF shows that network performance is slow


Product

  Prinergy 1.0; Prinergy 1.1; Prinergy Connect 2.0

Platform

 

Operating system

 


Error

 


Symptoms

 

The system seems like it’s slower than it should be. Running the NETPERF utility shows that network performance between the primary and secondary is much slower than expected.

How to reproduce: Change the TCP/IP service’s TcpWindowSize registry setting to an inappropriate value, one that would cause excessive communication overhead. For example, when the Packet Engines gigabit Ethernet card is used, mis-type the TcpWindowSize value that you’re supposed to enter, and put in 0xFFF (4095 decimal) instead of 0xFFFF (65,535 decimal).


Cause

 

Solution

 

Either remove the TcpWindowSize registry parameter completely so that NT chooses an appropriate default value (I recommend this for 100BaseT), or set it to an appropriate value (i.e. 0xFFFF for the gigabit card). This is in HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters

Permanent fix: TBD. Somehow we should detect at runtime if inappropriate network settings are in effect.

Permanent fix:


See also

 


Keywords

 

networking


Technical contact(s)
 

Simon Chen

Submitted by
 

Date submitted
 


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