Intel 860 PCI bandwidth problem

Greg Lindahl lindahl at
Fri Jan 18 21:58:46 PST 2002

On Fri, Jan 18, 2002 at 10:40:37PM -0700, Maurice Hilarius wrote:

> Implication: The early termination limits the maximum bandwidth to ~90 MB/s.

That note sounds like it's not talking about DMA operation. You did
look at the Myrinet Experiences website

and saw that measured PCI DMA performance is in the 200-300 MB/s
range, but it depends on some BIOS and other details, yes? Most non-GM
Myrinet drivers don't use DMA in one or both directions, and so this
problem would look terrible with them, but not GM. I don't know about

-- greg

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