VirtualBox

Ticket #1865 (new defect)

Opened 3 months ago

Last modified 1 month ago

Performance of NTVDM unacceptable

Reported by: CChrisA Assigned to:
Priority: major Component: other
Version: VirtualBox 1.6.2 Keywords:
Cc: Guest type: Windows
Host type: Linux

Description

Linux host/WinXP sp3 guest

When running an old 16 bit visual basic application under ntvdm performance is unacceptable. The processor use never drops below ~30%.

When using the application performance is dreadful. Screen paints can be watched and any operation involving IO is stunningly slow.

Machine is a conversion of a vmdk, IO APIC still in use (though configured as such).

Change History

08/15/08 23:58:26 changed by johanvz

Same problem here. Host is Vista x64 SP1. Guest is XP SP2(32bit). VirtualBox v1.6.4. When running 16bit application on guest ntvdm.exe utilizes 100% CPU on guest. Also, this is a brand new VM with no IO APIC enabled.

Maybe 64->32->16 is pushing it a bit.

09/16/08 10:27:11 changed by sandervl73

Without a VBox.log we can't say anything meaningful. Attaching the offending application would be useful too.

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