Bad Performance with NI-VISA and NI-488.2 under Win XP

I have an application (originally developed under LW/CVI 5.5.1), that use VISA for both, GPIB and serial communication. The application runs fine under NT 4.0 but under XP there are delays in conjunction with serial communication, which slow down the whole application. I already compiled the application with LW/CVI 6.0, installed NI-VISA V. 2.6.0 and NI-488.2 V. 2.0 but this didn't change anything. Do you have any ideas?

Hello Michael,
We have noticed the reduction in system performance in Windows XP when multiple ports are installed, and large packets are being read/written at high baud rates (460.8k). Performance is acceptable when using smaller packet sizes or slower baud rates (115.2k for example). It appeared to be a bug in XP, because the problem was fixed when a prerelease version of XP service pack 1 was installed.
Regards,
Ray Kong
NI Applications Engineer

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Hello,
I'm using LV 8.5.
I'm trying to develop a multiplatform (windows and mac os x) and multi-computer application. II want to get executables running on each device, communicating through the network. Communication process includes datas (such as images) and events messages (something like "Hello, I got an error" or "youyou, my work is done" or "I'm hereeeee!!!!...."). I do need a communication without any loss of data.
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Attachments:
Sender.JPG ‏87 KB
Receiver.JPG ‏96 KB

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Related Links:
Fixed Version:
Report Date: 08/01/96
Last Updated: 07/19/2002
Document ID: 0O076NGJ

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Hello,
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Attachments:
find_com_resources1.vi ‏82 KB
find_visa1.jpg ‏102 KB

Hello Benjamin,
thank you very much for the link!
This knowledge base article is not easy to find,
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Stefan
Attachments:
not enough rights.jpg ‏16 KB

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National Instruments
Applications Engineer
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Bad Performanc​e with NI-VISA and NI-488.2 under Win XP

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Bad Performance with NI-VISA and NI-488.2 under Win XP