Date: Sun, 19 Mar 2000 03:11:35 -0500 From: Peter Radcliffe <pir@pir.net> To: FreeBSD-STABLE@FreeBSD.ORG Subject: Re: SMP oddity Message-ID: <20000319031135.A20988@pir.net> In-Reply-To: <200003191700.LAA15601@aurora.sol.net>; from jgreco@ns.sol.net on Sun, Mar 19, 2000 at 11:00:47AM -0600 References: <200003191700.LAA15601@aurora.sol.net>
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Joe Greco <jgreco@ns.sol.net> probably said:
> Sun FE nearly hysterical once... got called in to replace a disk and he
> just HAD to open up the machine to find out why the banner reported _3_
> CPU's (I don't think there's a blessed configuration with 3, maybe there
> is)...
No, there isn't. Sun have always said that the processor modules in a
10 or 20 must be identical. Some other configurations work (when the
MBUS speed is the same), but are not supported.
Since you can only put two modules in, blessed configurations have
1, 2 or 4 CPUs, all processors identical.
> found a dual CPU card plus one rather faster single CPU, and swore
> that the disk problem ("the disk is DEAD, Jim") might be caused by my
> creative CPU engineering.
Heard the one about the DEC Field Circus engineer with a flat tire ?
He's the one changing the tires one by one to see which one is flat.
Heard the one about the DEC Field Circus engineer with a dead battery ?
He's the one changing the tires one by one to see which one is flat.
> Note that Solaris didn't have any idea how to deal with the CPU's from a
> scheduling point of view: it scheduled them all fairly equally, which
> wasn't exactly ideal, but better than it would have been with only two
> CPU's.
If all your CPUs are identical, which sun say they must be, then this
is fine. Not ideal, but they have an excuse.
Both of my home sparc 20s are (suprisingly for me) running in supported
processor configurations (4x50MHz and 2x75MHz). gmake -j4 is my friend.
P.
--
pir pir@pir.net pir@net.tufts.edu
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