Re: Info: NAPI performance at "low" loads

From: David S. Miller (
Date: Wed Sep 18 2002 - 15:46:30 EST

   From: Alan Cox <>
   Date: 18 Sep 2002 21:43:09 +0100
   The inb timing depends on the PCI bus. If you want proof set a Matrox
   G400 into no pci retry mode, run a large X load at it and time some inbs
   you should be able to get to about 100 milliseconds for an inb to
Matrox isn't using inb/outb instructions to IO space, it is being
accessed by X using MEM space which is done using normal load and
store instructions on x86 after the card is mmap()'d into user space.
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