>> If the mapping is being done via a device mapping, then the region will >> be marked non-cacheable. > >I remember that he said he created a character device /dev/tulip to >represent the network card. Actually, his work borrowed a lot from the >Cornell U-Net project (now the basis of VIA?). Can we change the >corresponding page table (directory) entries to be cacheable as needed?
You'd have to modify the kernel - specifically pmap_mapdev(). Note that the above behavior is only true for older versions of FreeBSD (pre-2.2). If you're having this problem within a newer version of FreeBSD, then it's probably something else causing it. -DG David Greenman Co-founder/Principal Architect, The FreeBSD Project - http://www.freebsd.org Creator of high-performance Internet servers - http://www.terasolutions.com To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-hackers" in the body of the message
