[Beowulf] Intel buys QLogic InfiniBand business

Greg Lindahl lindahl at pbm.com
Sat Jan 28 00:29:36 EST 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.

-- greg
(and if anyone needs a reminder, I no longer have any financial
involvement with QLogic or Intel.)







_______________________________________________
Beowulf mailing list, Beowulf at beowulf.org sponsored by Penguin Computing
To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf

-- 
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.



More information about the Beowulf mailing list