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MIN_GNT, MAX_LAT and class code effect on PCI master performance

Does anyone know if the PCI config settings
MIN_GNT, MAX_LAT & Class Code have any
effect on PCI mastering performance, on
any system out there ?

My impression is that noone actually uses these
numbers for anything like this, since few or none
of the motherboard chipsets support any control over
the behaviour of their PCI arbiters.

Am I wrong ?

Graeme Gill.