[ofw] MTHCA registry parameters

[Fab Tillier]

Hi folks,

 

What do the following registry parameters for MTHCA do?

 

HKR,"Parameters","TunePci",%REG_DWORD%,0

-          What does PCI tuning do?

-          Why is it off by default?

-          Does turning it on result in higher bandwidth or lower
latency?

-          What are the risks in turning it on?

 

HKR,"Parameters","ProcessorAffinity",%REG_DWORD%,0

-          Is this ISR or DPC affinity, or both?

-          Does this apply to kernel mode only?

 

HKR,"Parameters","MaxDpcTimeUs",%REG_DWORD%,10000

-          What does this do?

-          How does it affect performance when the value is increased or
lowered?

-          Is this default value tuned for performance or system
responsiveness?

 

Thanks!

-Fab

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