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> > 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. _______________________________________________ freebsd-current@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"