On Fri, Apr 29, 2005 at 12:33:54PM -0700, Grant Grundler wrote:
Being mostly clueless about Quadrics implementation, I'm probably missing something that makes Quadrics a MMU but not the IB variants. Can someone clue me in please?
As far as I can tell it's mostly a marketing distinction. Many Quadrics customers run with memory registration, and Mellanox could probably alter their firmware to not require registration. Myricom certainly can, and in fact Patrick Geoffrey claimed they were doing so in their MX software. The only one I know of that isn't that flexible is PathScale's InfiniPath. Ours is a pure hardware mechanism, but it requires memory registration and is clearly not an MMU.
Greg, only a few of our evaluation customers use the patch free (and hence page-pinning) software release.
Most do apply our simple IOPROC patch and run without requiring page pinning whilst still achieving the peak bandwidth and low latency of our hardware.
Cheers Addy.
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