PIO NICs.
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Donald Becker becker at scyld.comMon Oct 15 08:43:13 PDT 2001
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On Mon, 15 Oct 2001, Hong Ong wrote: > currently, I am trying to compile a list of NICs that support > programed I/O (PIO). However, I only manage to find one which is > Myrinet. Very few modern Ethernet NICs support programmed I/O. PIO is faster for tiny packets, but adds too much CPU overhead for Ethernet-sized packets. So you are likely to see PIO only for cluster network adapters, not Ethernet. The only PCI Ethernet adapters that support PIO are the NE2000 clones, usually 10Mbps only, and the 3Com 3c590/3c900 series boards. A few of the current 3Com designs still have the legacy PIO support, but it's rarely used and never tested. There are a few other chips where it's possible to use the FIFO diagnostic capability to send PIO packets, but not operationally. There are too many hardware races. Donald Becker becker at scyld.com Scyld Computing Corporation http://www.scyld.com 410 Severn Ave. Suite 210 Second Generation Beowulf Clusters Annapolis MD 21403 410-990-9993
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