Date: Tue, 17 Mar 2009 13:30:52 +0100 (CET) From: Oliver Fromme <olli@lurza.secnetix.de> To: freebsd-smp@FreeBSD.ORG, won.derick@yahoo.com, John Baldwin <jhb@FreeBSD.ORG>, Robert Heron <robert@heron.pl> Subject: Re: only one logical CPU used in Xeon Message-ID: <200903171230.n2HCUqjB080921@lurza.secnetix.de> In-Reply-To: <916655.40447.qm@web45808.mail.sp1.yahoo.com>
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won.derick@yahoo.com wrote: > John Baldwin wrote: > > in the ULE case (though the sysctl doesn't work). If > > you use 4BSD on 7.1 > > then the tunable and sysctl will work fine. > > > > I tried this, but I can't see the variable being displayed. Then your machine doesn't support hyperthreading. The machdep.hyperthreading_allowed sysctl is only present if your machine actually has multiple logical CPUs. If you don't see that sysctl, then your processor doesn't have multiple hyperthreaded CPUs. If you're interested how this is done in the source, see the function cpu_hlt_setup() in src/sys/amd64/amd64/mp_machdep.c or src/sys/i386/i386/mp_machdep.c, respectively. 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 C++: "an octopus made by nailing extra legs onto a dog" -- Steve Taylor, 1998help
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