Re: Linux 2.5 / 2.6 TODO (preliminary)

From: Jesse Pollard (
Date: Thu Jun 01 2000 - 05:25:01 EST

On Wed, 31 May 2000, Gregory Maxwell wrote:
>On Wed, 31 May 2000, Kenneth C. Arnold wrote:
>> mount cpu2). But can you really hot-swap CPUs just by not scheduling
>> any processes to them? It seems like you'd need to do some BIOS stuff
>> first (I don't have an SMP system, so I don't know this stuff).
>Some hardware supports it (We're talking Starfire level here).. But I
>really don't see the use: How many times has a CPU failed on you? Okay,
>maby once... Now.. How many times did it fail with warning and not just
>randomly corrupt kernel structures.. Exactly. :)
>I don't think that Linux currently supports any SMPs with asymetric
>clocks, so it wouldn't be useful there..
>About the only think I can think of is turning off CPUs on a SMP
>laptop for powermanagement.. :P So unless someone from transmeta speaks
>up about a quad cpu laptop this just sounds like a feature looking for a
>need. (i.e. worthless cruft)

I've seen a system loose 2-3 CPUs after a bad power failure. For some
systems it would be usefull (the system comes up with 3 dead CPUs -
Each is rplaced in the system, then activate them.

There are organizations that just do not tolerate downtime well and
will not permit unscheduled maintenance if it can be avoided.

Jesse I Pollard, II

Any opinions expressed are solely my own.

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