Date: Wed, 21 Sep 2005 23:47:00 -0700 From: Colin Percival <cperciva@freebsd.org> To: Martin Nilsson <martin@gneto.com> Cc: freebsd-current@freebsd.org, Jung-uk Kim <jkim@freebsd.org> Subject: Re: [PATCH] AMD multicore detection Message-ID: <43325364.8090208@freebsd.org> In-Reply-To: <43325114.4090907@gneto.com> References: <200509211550.27524.jkim@FreeBSD.org> <43325114.4090907@gneto.com>
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Martin Nilsson wrote: > Jung-uk Kim wrote: >> New patch is here: >> http://people.freebsd.org/~jkim/multicore.diff >> >> Please test and let me know. I don't have multicore CPU to test it >> for myself. :-( > > The below is on a Pentium D 820 (Dualcore). I don't like that the two > cores are reported as hyperthreading when the CPU does not support > hyperthreading (only the 840 EE does). If we ship 6.0 with HT disabled > I'm afraid that it will turn off one of the cores, right? It shouldn't. Dual-core processors claim to be hyperthreaded, but when I wrote the patch which disabled hyperthreading I added extra (and rather complicated) code to detect dual-core processors and *not* disable them. If I got it wrong, please let me know. :-) Colin Percival
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