On Thu, Mar 31, 2016 at 4:39 PM, John Baldwin <jhb_at_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 <rizzo_at_iet.unipi.it> > wrote: > > > > > 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 a BAR.Received on Thu Mar 31 2016 - 19:55:47 UTC
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