Re: Info: NAPI performance at "low" loads

[David S. Miller]

   From: Alan Cox <[e-mail]>
   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
   execute
   
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.