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Re: Info: NAPI performance at "low" loads

To: alan@xxxxxxxxxxxxxxxxxxx
Subject: Re: Info: NAPI performance at "low" loads
From: "David S. Miller" <davem@xxxxxxxxxx>
Date: Wed, 18 Sep 2002 13:46:30 -0700 (PDT)
Cc: ebiederm@xxxxxxxxxxxx, hadi@xxxxxxxxxx, akpm@xxxxxxxxx, manfred@xxxxxxxxxxxxxxxx, netdev@xxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <1032381789.20498.151.camel@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
References: <m1hegnky2h.fsf@xxxxxxxxxxxxxxxxxxx> <20020918.132334.102949210.davem@xxxxxxxxxx> <1032381789.20498.151.camel@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Sender: netdev-bounce@xxxxxxxxxxx
   From: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
   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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