From owner-freebsd-hackers@FreeBSD.ORG  Wed Sep 13 06:36:03 2006
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Date: Wed, 13 Sep 2006 09:36:01 +0300
From: Danny Braniss <danny@cs.huji.ac.il>
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Subject: numbers don't lie ...
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Im testing these 2 boxes, Sun X4100 and Dell-2950, and:

	SUN X4100:	Dual Core AMD Opteron(tm) Processor 280 (2393.19-MHz K8-class CPU)
			one 70g sata disk
	DELL 2950:	Intel(R) Xeon(TM) CPU 3.20GHz (3192.98-MHz K8-class CPU)
			4 sata disks + raid0

they both run identical 6.1-STABLE.

my 'cpu benchmark' shows the amd being much better than the intel.
but, doing a make buildworld give interesting results:

dell-2950 : make -j16 TARGET_ARCH=amd64 buildworld : 24m17.41s real 1h3m3.26s 
user 17m15.07s sys
dell-2950 : make -j8 TARGET_ARCH=amd64 buildworld : 24m8.28s real 1h2m59.38s 
user 16m16.20s sys

sunfire : make -j16 TARGET_ARCH=amd64 buildworld : 24m21.38s real 49m6.68s 
user 14m22.64s sys
sunfire : make -j8 TARGET_ARCH=amd64 buildworld : 23m47.69s real 48m53.58s 
user 13m44.81s sys

which probably says something about my 'cpu benchmark' :-(
but why is the user time so much different between the boxes?

danny