Messages in this thread |  | | From | "Albert D. Cahalan" <> | Subject | Re: bigphysarea support in 2.2.19 and 2.4.0 kernels | Date | Sun, 24 Dec 2000 03:59:23 -0500 (EST) |
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Eric W. Biederman writes:
> If you are doing a real time task you don't want to very close > to your performance envelope. If you are hitting the performance > envelope any small hiccup will cause you to miss your deadline, > and close to your performance envelope hiccups are virtually certain. > > Pushing the machine just 5% slower should get everything going > with multiple pages, and you wouldn't be pushing the performance > envelope so your machine can compensate for the occasional hiccup. > >> The data stream is fat and relentless. > > So you add another node if your current nodes can't handle the load > without using giant physical areas of memory. Attempt to redesign > the operating system. Much more cost effective.
Nodes can be wicked expensive. :-)
Pushing the performance envelope is important when you want to sell lots of systems. Radar is a similar computational task, with the added need to reduce space and weight requirements. It's not OK to be 5% more expensive, bulky, and heavy.
Also the Airplane Principal: more nodes means more big failures.
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