linux user group brescia

giusto per avvalorare quanto si dice in mailing list, riporto un paio di
stralci di post, dei big nel development del kernel, riguardo una
discussione su microcessori/affidabilita`:

scrive cox
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On Wed, 2002-12-11 at 16:08, Orion Poplawski wrote:
> Is there a good site for pointers towards assembling reliable Linux 
> machines?  It seems to me the trickiest part of the whole operation is 
> choosing good hardware in the first place.  I just started a new job and 
> inherited a buch of new but flakey machines, and I'd like to avoid doing 
> that in the future.

The AMD duals have been a disaster in my experience. Its a shame because
when they do go they really are very fast boxes. The biggest factor I've
found is chipsets.
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e ancora, riguardo il fatto che uguali configurazioni hardware producano
risultati totalmente differenti
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On Wed, 2002-12-11 at 23:35, Patrick Finnegan wrote:
> Which chipset - the new or the old one?  I've got an ASUS A7M266D (or
> something) that's based on the AMD 760MPX chipset and has 512MB of
> Registered ECC memory, and a pair of XP 1800+'s... and it works just
> beautifuly.  Truely rock solid.

Same board you have.
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scrive linus, riguardo il P4
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P4's really suck at system calls.  A 2.8GHz P4 does a simple system call
a lot _slower_ than a 500MHz PIII.

The P4 has problems with some other things too, but the "int + iret"
instruction combination is absolutely the worst I've seen.  A 1.2GHz
Athlon will be 5-10 times faster than the fastest P4 on system call
overhead.

HOWEVER, the P4 is really good at a lot of other things. On average, a
P4 tends to perform quite well on most loads, and hyperthreading (if you
have a Xeon or one of the newer desktop CPU's) also tends to work quite
well to smooth things out in real life.

In short: the P4 architecture excels at some things, and it sucks at
others. It _mostly_ tends to excel more than suck.
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ciao,
andrea

-- 
In short: just say NO TO DRUGS, and maybe you won't end up like the Hurd
people.
		-- Linus Torvalds <torvalds a transmeta.com>