Date: Fri, 26 Jan 2007 05:19:14 +0800 From: LI Xin <delphij@delphij.net> To: Oles Hnatkevych <don_oles@able.com.ua> Cc: freebsd-stable@freebsd.org Subject: Re: second cpu not used on smp platform Message-ID: <45B91ED2.6080800@delphij.net> In-Reply-To: <1638945315.20070125224856@able.com.ua> References: <1638945315.20070125224856@able.com.ua>
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[-- Attachment #1 --] Oles Hnatkevych wrote: > Hello! > > Just cvsup-ed and upgraded to 6.2-STABLE. > > The box has hyperthreading processor: > > # more /var/run/dmesg.boot |grep -i cpu > CPU: Intel(R) Pentium(R) 4 CPU 3.00GHz (3000.37-MHz 686-class CPU) > Logical CPUs per core: 2 > FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs > cpu0 (BSP): APIC ID: 0 > cpu1 (AP): APIC ID: 1 > cpu0: <ACPI CPU> on acpi0 > cpu1: <ACPI CPU> on acpi0 > SMP: AP CPU #1 Launched! [...] > What it can be???? This is done intentionally on all -STABLE branches, see http://security.freebsd.org/advisories/FreeBSD-SA-05:09.htt.asc for details. Note that it is possible to re-enable htt if you know what you are doing, by setting machdep.hyperthreading_allowed. Please note that enabling hyperthreading does hurt performance for many cases, so you will want to evaluate if you really want it, or to disable it from BIOS. Cheers, -- Xin LI <delphij@delphij.net> http://www.delphij.net/ FreeBSD - The Power to Serve! [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFFuR7SOfuToMruuMARAw1lAJ9lKAA4k/mztaoQmrC4GkKd9O4zbwCdFTTE 7MQUbULdZ3hAsnMEWwpam5c= =kr9r -----END PGP SIGNATURE-----
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