Date: Thu, 25 Aug 2005 19:32:42 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: Andre Oppermann <andre@freebsd.org> Cc: "Justin R. Smith" <jsmith@drexel.edu>, freebsd-current@FreeBSD.org Subject: Re: Hyperthreading degrades performance? Message-ID: <20050825193221.R72462@fledge.watson.org> In-Reply-To: <430E0ABA.7080600@freebsd.org> References: <430DF217.2020908@drexel.edu> <20050825173440.O16967@fledge.watson.org> <430E09F8.8090001@freebsd.org> <20050825191230.C16967@fledge.watson.org> <430E0ABA.7080600@freebsd.org>
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On Thu, 25 Aug 2005, Andre Oppermann wrote: > Robert Watson wrote: >> >> On Thu, 25 Aug 2005, Andre Oppermann wrote: >> >>> Don't forget better PIV revisions with larger instruction decoder caches, >>> better cache prefetching and branch prediction. I doubt much of the >>> improvement is due to our SMP changes. A real test to find out whether >>> it's our work or Intels would be to benchmark an old (pre Nacona) PIV >>> running 5.3R and 7.0-current vs. a new one doing the same. >> >> Well, given that my test box for this hasn't changed in three years, I >> think I can safely argue it's not the hardware :-). > > Ok, you win. :-) > > Then the effect of HTT should be much better if you would pop in one of > the latest PIV revisions. My test machine aside, I'm quite willing to believe the hardware has gotten better though. :-) Robert N M Watson
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