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Cross Bow

An interconnect ASIC on Silicon Graphics provides support for the XIO bus found on SGI ‘ccNUMA' designs, such as the SGI Octane (IP30) and Origin (IP27 and IP35) families, as well as related systems such as Onyx 3xx and SGI Tezro. XIO components are called ‘widgets' and contain either I/O devices, processors, or memory.

A XIO bus supports up to 16 widgets, but the existing designs only use up to 8.

Special ‘hub' widgets allow several XIO buses to be interconnected, expanding the capacity of a given system, and allowing complex multi-node systems to be built.

Xbow is a Crossbar switch a many to many switch


xbstat monitors an xbow in real time.

Command run on "Mickey" an Octane with 8Gb RAM:

xbstat -d /hw/node/xtalk/0/mon

Part of the hinv of that machine:

Location: /hw/node
            PM20 Board: barcode HRJ328     part 030-1356-001 rev  J
Location: /hw/node/xtalk/15
            IP30 Board: barcode KJN377     part 030-1467-001 rev  D
Location: /hw/node/xtalk/15/pci/2
    PWR.SPPLY.ER Board: barcode AAE9460440 part 060-0035-002 rev  A
             FP1 Board: barcode 33094C     part 030-0891-003 rev  E
Location: /hw/node/xtalk/13
        XTALKPCI Board: barcode LKY520     part 030-0952-005 rev  E
Location: /hw/node/xtalk/12
           MOT20 Board: barcode JKD288     part 030-1240-003 rev  G

See also