Messages in this thread | | | Date | Wed, 15 May 2002 01:01:07 -0400 | From | Pete Zaitcev <> | Subject | Re: InfiniBand BOF @ LSM - topics of interest |
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> Date: Wed, 15 May 2002 03:35:00 +0100 (BST) > From: Alan Cox <alan@lxorguk.ukuu.org.uk>
> According to folks at Quantum the IB stuff isnt doing 'true' congestion > control. At the moment its hard to tell since 1.0a doesn't deal with > congestion management and the 2.0 congestion stuff isnt due out until > later this year. Even then the Infiniband trade association folks use > words like "hopefully eliminating the congestion" in their presentation to > describe their mechanism.
The thing about Infiniband is that its scope is so great. If you consider Infiniband was only a glorified PCI with serial connector, the congestion control is not an issue. Credits are quite sufficient to provide per link flow control, and everything would work nicely with a couple of switches. Such was the original plan, anyways, but somehow cluster ninjas managed to hijack the spec and we have the rabid overengineering running amok. In fact, they ran so far that Intel jumped ship and created PCI Express, and we have discussions about congestion control. Sad, really...
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