We have a problem with the speed of a DOS application run on a client from a network share. The application is written in Clipper; it is in a shared directory on a Windows 2000 SP4 server. The clients have a mapped network drive and execute the application from it.
When Avast Antivirus Server Edition is installed, the DOS application on the client is much slower. When testing a database query the following results became clear:
Without Avast on server (Avast on client or not does not make a difference):
Locally: 5 seconds / CPU 100% NTVDM
Client PC on the network: 8 seconds / CPU 100% NTVDM on client / CPU 5-15% SYSTEM on server
Network usage: 12.5%
With Avast on server:
Locally: 7 seconds / CPU 100% NTVDM
Client PC on the network: 37 seconds / CPU 100% NTVDM on client / CPU ca. 8% SYSTEM on server
Network usage: 5%
Testing systems:
Server: P2 400 MHz, 256 MB RAM, Windows 2000 Server SP4 including all updates
Client: P2 400 MHz, 256 MB RAM, Windows XP SP2 including all updates
Similar results apply when using their normal system:
Server: P3 500 MHz, 256 MB RAM, Windows 2000 Server SP4 including all updates
Client: P4 2400 MHz, 256 MB RAM, Windows XP SP2 including all updates
Different settings for the scanner, the resident shield, disabling different providers etc., including disabling the scanner altogether do not make a difference. Even stopping the Antivirus Service does not correct the problem. Just uninstalling Avast helps!
Is there a solution?
