Date: Mon, 6 Feb 2006 12:44:20 -0800 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: freebsd-amd64@freebsd.org Subject: Difference in stepping numbers? Message-ID: <20060206204419.GA51097@troutmask.apl.washington.edu>
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Anyone know what the difference between stepping=8 and a stepping=10 opteron processors? When I purchased the processors I never noticed the different values because dmesg reports only the cpu info for the first processor, cpu0, which was stepping=8 in my case. I've recently experienced segfaults and signal 10s during builds of the GCC source tree. I narrowed the problem down to a possible problem with one of the cpus. Well, I yanked cpu0 with stepping=8 and moved cpu1 with stepping=10 into the location of cpu0. Booting a UP kernel revealed: CPU: AMD Opteron(tm) Processor 248 (2194.48-MHz K8-class CPU) Origin = "AuthenticAMD" Id = 0xf5a Stepping = 10 Features=0x78bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR, PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2> AMD Features=0xe0500800<SYSCALL,NX,MMX+,LM,3DNow+,3DNow> At the moment, I have not been able to generate a signal 10 or 11 under fairly heavy load on cpu with stepping=10. -- Steve
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