Date: Wed, 11 Mar 2009 09:03:28 +0100 (CET) From: Oliver Fromme <olli@lurza.secnetix.de> To: freebsd-smp@FreeBSD.ORG, robert@heron.pl Subject: Re: only one logical CPU used in Xeon Message-ID: <200903110803.n2B83SxX097243@lurza.secnetix.de> In-Reply-To: <FD641002-AEA3-4C8E-93E0-3FE67BB658FA@heron.pl>
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Robert Heron wrote: > Oliver Fromme wrote: > > No need for benchmarks here, because Robert's processors > > don't do hyperthreading at all. FreeBSD 6.2 recognized > > the *cores* as logical HT processors, so he needs to > > set hyperthreading_allowed in order to enable the cores. > > > > Of course, the better solution is to update to a more > > recent release, such as 6.4 or even 7.1. His 6.2 is > > more than 2 years old and contains lots of known bugs, > > of which the wrong recognition of cores is a relatively > > harmless one. > > I also tried 6.4 with exactly the same wrong results as 6.2. That's suprising. Actually I think that all fixes to the CPU detection code have been backported to 6-stable. > 7.1 is OK, but is has hyperthreading_allowed=1 by default. What happens if you set hyperthreading_allowed=0 on 7.1? Are you 100% sure that your processor are really multi-core and not just hyperthreaded? Please post the relevant lines from /var/run/dmesg.boot or output from the `dmesg` command (as Adrian already suggested), preferably on a recent FreeBSD system (i.e. 7.1). The top 25 lines should be sufficient. 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 "Documentation is like sex; when it's good, it's very, very good, and when it's bad, it's better than nothing." -- Dick Brandonhelp
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