Messages in this thread | | | Date | Wed, 18 Sep 2002 13:46:30 -0700 (PDT) | Subject | Re: Info: NAPI performance at "low" loads | From | "David S. Miller" <> |
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From: Alan Cox <alan@lxorguk.ukuu.org.uk> 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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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