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IV. UTILITIES & DRIVERS
The performance monitoring is only available when using interrupt driven DMA.
Other configurations will allow graphs to be generated but they may not be mean-
ingful. In addition the BitBlt for swapbuffers is not presently taken into account in
the GLINT busy time, so the results are only strictly accurate for single buffered or
color space double buffered applications.
Examinable performance counters
% GLINT busy: This variable indicates the percentage of time that the GLINT
chip spends rendering.
% Host busy: This variable indicates the percentage of time that the host CPU
spends in the application and in the driver but not waiting for GLINT DMA to com-
plete.
% Wait DMA: This variable indicates the percentage of time that the host is waiting
for space in the DMA buffer queue. When this value becomes nonzero it indicates that
the queue of DMA buffers is full and that the driver must wait for GLINT to complete
the existing DMA buffer and start the next one to free a space in the queue.
DMA Buffer loads/sec: This is the number of DMA buffers that are being started
every second by the DMA interrupt handler.
DMA dwords/sec: This is the number of dwords of information that are being
DMAd to GLINT every second. This number divided by the number of buffer loads
per second gives the average size used in each DMA buffer.
% Wait VBlank: This variable can be used in non-interrupt driven DMA mode to
see the percentage of time that the host spends waiting for the VBLANK interrupt.
In interrupt driven DMA mode this value will always be zero.
Configuring GLINT Performance Monitoring
On a Pentium machine the performance monitoring is installed as follows:
•
Open a Command Prompt DOS window
•
Insert the Windows NT 3.51 driver floppy into the drive "A:"
•
Change to drive "A:"
•
Type the command: lodctr glntctrs.ini
•
The performance monitoring is now set for use.
If at any time it is necessary to rerun the lodctr utility then the following command
should first be run to uninstall GLINT performance monitoring capability:
unlodctr glint
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ASUS 3DP-V500TX
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