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Drivers & Software

Adept II

MSI vs LineBased PCI-E communication

Some theory first:

Been tweaking this setting in registry, trying to fix issues on certain old titles - mainly stutterring.  So far:

When driver is set to LineBased mode:
- no measurable performance penalty
- Uses up to 150 ISR and 150 DPC calls, taking 3-5 miliseconds over 1 minute benchmark when idle.

When driver is set to MSI mode:
- no measurable performance benefit nor penalty
- Uses DPC calls only, taking 0,7 milisecond over 1 minute benchmark when system is idle.

Few questions:
1. What is currently the default mode for the Radeon GPU drivers?
2. Will there be support for MSI-X mode?

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