In <20090519193727.7512e4fc...@xroff.net>, emor...@xroff.net write: >I have read recently this >http://www.wwpi.com/hardware/hardware/6540-ethernet-tunneling-through-pci-express-inter-processor-communication-low-latency-storage-io
(From a company that makes PCIe switches to connect multiple root complexes together.) >It's about using PCIe to connect 2 servers directly, without using >ethernet or other hardware. > >Can it be done in FreeBSD? What is needed to know? Certainly. Non-transparent PCIe bridges basically create windows of memory space into the other side. You'd need the two sides to agree on the data structures, and what signalling mechanism to use for packet availability. Quite straightforward, really. What you'll need is the bridge hardware that connects to the two systems, the two systems, datasheets, and some time. Each side of the bridge would allocate some DMAable memory, and set up the bridge so that is visible to the other side. Set up a pair of rings (one per direction of traffic), and go. -- Steve Watt KD6GGD PP-ASEL-IA ICBM: 121W 56' 57.5" / 37N 20' 15.3" Internet: steve @ Watt.COM Whois: SW32-ARIN Free time? There's no such thing. It just comes in varying prices... _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
