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Date:      Fri, 18 Dec 1998 03:50:05 -0800
From:      "Jordan K. Hubbard" <jkh@zippy.cdrom.com>
To:        Karl Pielorz <kpielorz@tdx.co.uk>
Cc:        current@FreeBSD.ORG
Subject:   Re: Also seeing IRQ oddness with -current now. 
Message-ID:  <31115.913981805@zippy.cdrom.com>
In-Reply-To: Your message of "Fri, 18 Dec 1998 11:38:08 GMT." <367A3EA0.793C5806@tdx.co.uk> 

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> My SuperMicro P6DNF has done this since the first time I ran SMP -current on
> it... I vaguely remember talking to someone about it - I'm sure they said it

OK, well, let me ask you another question then:

Going from a single to dual CPU configuration, did you see any change
in your "worldstone" times?  Before I added a second CPU to my PII/450
tonite (and started seeing those messages as a consequence of added
SMP support), I carefully timed a `make -j4 world' running off a
single 9GB Cheetah with soft updates enabled for all file systems.

With one CPU, it's 1:05.  With two CPUs, it's 1:01.  This either
proves that I'm seriously I/O bound or that multiple CPUs aren't
helping the compile times for some weird reason. :-)

None of the other benchmarks I've found (GENERICstone, rc5,
calculating pi :-) seem to be affected by single-vs-dual CPU, but this
doesn't particularly surprise me either.  The fact that rc5crack
claims to use multiple CPUs doesn't necessarily make it so and none of
the others are designed to benefit from SMP at all.

Hmmmm.  As usual, we come down to the fact that we really don't have
any decent benchmarks for measuring the effectiveness of SMP.  I've
asked the folks who sell SMP Linux systems at VA Research about this
and they've also confessed to not really having any decent ways of
actually testing Linux's effectiveness for SMP.  Looks like we can at
least claim parity with Linux as far as that one is concerned. :-)

- Jordan

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