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 (also .1 is heavily outdated .15 is the current which apparently fixes several bugs).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@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
