Date: Wed, 14 Dec 2005 19:06:05 -0500 From: Jonathan Noack <noackjr@alumni.rice.edu> To: Scott Long <scottl@samsco.org> Cc: stable@freebsd.org Subject: Re: Odd performance problems after upgrade from 4.11 to 6.0-Stable Message-ID: <43A0B36D.6090906@alumni.rice.edu> In-Reply-To: <43A0A812.1060104@samsco.org> References: <20051214222037.94FEF5D07@ptavv.es.net> <43A0A812.1060104@samsco.org>
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Scott Long wrote: > Also, taking out CPU_I586 is usually a bad idea. It offers no > performance penalties (unlike CPU_I386 and maybe CPU_I486), but > enables things like optimized bcopy. Is that documented? In /sys/i386/conf/NOTES I see: # You must specify at least one CPU (the one you intend to run on); # deleting the specification for CPUs you don't need to use may make # parts of the system run faster. # cpu I486_CPU cpu I586_CPU # aka Pentium(tm) cpu I686_CPU # aka Pentium Pro(tm) I've always commented out I486_CPU and I586_CPU. Shouldn't leaving in I686_CPU enable all the features it can use? Do you mean I've spent all these years using un-optimized bcopy?!? -Jonathan
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