From mboxrd@z Thu Jan 1 00:00:00 1970 From: "S. Kurt Newman" Subject: Re: 2.6.32.1 kernel configuration only seeing 1 core on Intel E5540 CPU Date: Thu, 24 Jun 2010 08:39:11 -0500 Message-ID: <4C235FFF.9030603@globaldataguard.com> References: <4C22907A.6020601@globaldataguard.com> <201006240943.38529.carsten.aulbert@aei.mpg.de> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <201006240943.38529.carsten.aulbert@aei.mpg.de> Sender: linux-admin-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: Carsten Aulbert Cc: linux-admin@vger.kernel.org Hi Carsten. Yes, the custom kernel is a 32-bit variant. However, the Ubuntu and CentOS systems I loaded are also 32-bit. Or so I think they are... I don't recall explicitly downloading the 64-bit variations of those OSs. As far as using .1 instead of .15, I can try using a more recent revision to help fix bugs that may exist.. however due to some OS constraints I don't think I can go that far. At least not without using custom patches. For poserity's sake, let's assume all kernels I've used are 32-bit. How would the 2.6.28 (and 2.6.18) kernels support them, but the 2.6.32 that I'm using wouldn't? Thanks, Kurt Carsten Aulbert wrote: > Hi Kurt > > On Thursday 24 June 2010 00:53:46 Kurt Newman wrote: >> I've loaded this same i7 Nehalem machine with CentOS 5.3 >> (2.6.18-128.el5PAE), Ubuntu 9.04 (2.6.28-11-generic), and a modified >> distro with a custom kernel (2.6.32.1). >> >> The CentOS and Ubuntu kernels find all 4 cores just fine; however, my >> custom kernel only finds 1. I've enabled the following: >> >> - SMP >> - X86_BIGSMP (systems with more than 8 cpus) >> - X86_EXTENDED_PLATFORM (extended x86 platform) >> - SCHED_SMT (hyper-threading) >> - SCHED_MC (Multi-core scheduler) >> - and varied between M686 (Pentium Pro) and MCORE2 (newer Xeon) > > Just guessing, but could the CentOS and Ubuntu Kernel be a 64bit variant, > while your custom one is 32bit? (also .1 is heavily outdated .15 is the > current which apparently fixes several bugs). > > I've not been using 32bit kernel for a couple of years and never with a multi- > core system thus just poking into the dark here. > > HTH > > Carsten > -- > To unsubscribe from this list: send the line "unsubscribe linux-admin" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html