[Beowulf] Intel buys QLogic InfiniBand business
lindahl at pbm.com
Fri Jan 27 21:29:36 PST 2012
On Fri, Jan 27, 2012 at 06:10:02PM -0800, Bill Broadley wrote:
> Anyone have an estimate on how much latency a direct connect to QPI
> would save vs pci-e?
~ 0.2us. Remember that the first 2 generations of InfiniPath were both
SDR: one for HyperTransport and one for PCIe. The difference was 0.3us
back then; PathScale + QLogic did some heroic things since to shorten
the pipeline stages & up the clock rate.
(and if anyone needs a reminder, I no longer have any financial
involvement with QLogic or Intel.)
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