An update to my original post: We loaded Red Hat Linux 8.0 onto a new rack-mount PE 2650, but it would freeze within 1/2 hour, no errors. The LCD said "MISSING CPU 1", "MISSING CPU 2", and something like "VOLT CPU CORE". It would stay up in single-processor mode. Dell had us upgrade the firmware and pull power for 2 minutes - that cured the LCD errors, and Red Hat's logs reflected it's understanding there were 2, not 4 processors - but it still froze. Then they said they don't support RH Linux 8.0 yet. Red Hat Support had us turn off processes until it stayed up, which was everything - it froze with just eth0 up and sshd. Then they had us add "noapic" to the SMP kernel's GRUB config, and now it works. They didn't elaborate, and we haven't found much doc, but it sounds like now the first CPU handles all interrupts. Dell hasn't responded yet to my question "Does a PE 2650's processors / motherboard / whatever support APIC?". Our processors are XEON 2.something Ghz. One article implied APIC can increase performance by 10%-20%. There's plenty of power so it's not critical, but we're still curious... -- Psyche-list mailing list Psyche-list@redhat.com https://listman.redhat.com/mailman/listinfo/psyche-list
