On Thu, Mar 31, 2016 at 4:39 PM, John Baldwin <j...@freebsd.org> wrote:
> On Wednesday, March 30, 2016 11:20:51 AM Jim Harris wrote:
> > On Wed, Mar 30, 2016 at 10:47 AM, Luigi Rizzo <ri...@iet.unipi.it>
> > > Hi,
> > > I'd like to test the rate at which I can access device registers
> > > on a PCIe card, and was wondering whether I need to patch a device
> > > driver, or perhaps I can use /dev/kmem once I figure out where
> > > the registers are mapped ?
> > >
> > You do not need to patch a device driver. Have you looked at
> > libpciaccess? This should give you everything you need.
> You can also look at what pciconf uses. (It has a read_config() method
> that uses an ioctl on an fd of /dev/pci).
pciconf can only access the configuration space, right? I believe that
Luigi is more interested in measuring the latency to a register mapped from
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