Date: Wed, 25 Apr 2007 16:08:06 +0200 (CEST) From: Oliver Fromme <olli@lurza.secnetix.de> To: freebsd-stable@FreeBSD.ORG, tarkhil@webmail.sub.ru Subject: Re: 6.2-RELEASE does not use second CPU on pentium D Message-ID: <200704251408.l3PE86XV059658@lurza.secnetix.de> In-Reply-To: <462F15B4.4010201@webmail.sub.ru>
next in thread | previous in thread | raw e-mail | index | archive | help
Alex Povolotsky wrote: > I have a Pentium D box, running 6.2-RELEASE. In dmesg, I see CPU#1 > launched, but I never see any process running on it, and mptable shows Hyperthreading is disabled by default in FreeBSD (for security reasons). You can enable it via sysctl if you want (machdep.hyperthreading_allowed=1). However, note that it might not make your machine any faster (in fact, a UP kernel might be faster; it depends on the kind of programs that you're running). Also not that there is a potential security issue with hyper- threading (information leak). Best regards Oliver -- Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing b. M. Handelsregister: Registergericht Muenchen, HRA 74606, Geschäftsfuehrung: secnetix Verwaltungsgesellsch. mbH, Handelsregister: Registergericht Mün- chen, HRB 125758, Geschäftsführer: Maik Bachmann, Olaf Erb, Ralf Gebhart FreeBSD-Dienstleistungen, -Produkte und mehr: http://www.secnetix.de/bsd "When your hammer is C++, everything begins to look like a thumb." -- Steve Haflich, in comp.lang.c++
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200704251408.l3PE86XV059658>