<html><head><style type="text/css"></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><div>Message: 6 Date: Wed, 16 Aug 2006 16:23:18 -0400 From: Matthew Miller <mattdm@mattdm.org> Subject: Re: SMP Kernel on non-SMP Machine To: For users of Fedora Core releases <fedora-list@redhat.com> Message-ID: <20060816202318.GC18410@jadzia.bu.edu> Content-Type: text/plain; charset=us-ascii On Wed, Aug 16, 2006 at 02:09:20PM -0600, Ski Dawg wrote: > Now, we used to do this at work (on RHEL) without any problems. We also > installed the SMP kernel on machines that were single processor with no > hyperthreading. We did this so that developers were working with the > same kernel, no matter which machine they were using. Everything ran > just fine with the SMP kernel on all the machines. In fact, if your processor has the "nx" bit (look in the "flags") line in /proc/cpuinfo, you will get a performance increase in system calls by using the SMP kernel even on single-processor systems. I don't recall the particulars of this, but there was a thread on fedora-devel a while ago about it if you care to search. (This is one reason SMP is enabled in all kernels in FC6.) -- Matthew Miller mattdm@mattdm.org <<a target="_blank" href="http://mattdm.org/">http://mattdm.org/</a>> Boston University Linux ------> <<a target="_blank" href="http://linux.bu.edu/">http://linux.bu.edu/</a>> Thanks for the help. The processor is a hyperthreading processor. I do not have the "nx" flag in /proc/cpuinfo. Here is the output for one of the CPUs since the listing are virtually identical. processor : 1 vendor_id : GenuineIntel cpu family : 15 model : 2 model name : Intel(R) Pentium(R) 4 CPU 2.80GHz stepping : 5 cpu MHz : 2793.303 cache size : 512 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 1 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid xtpr bogomips : 5586.39 I got my self into this problem because I downloaded kernel.devel to build a VPN client not realizing there was a separrate source code for the SMP kernel. Needless to say, I could not install the module I built and went looking for the culprit. Wes. </div></div> </div></div></body></html>