On Tue, 2006-08-08 at 18:10 -0400, Dan Halbert wrote: > We are using CentOS-4.3 (x86_64) with Opteron servers, and noticed a > problem with cpuspeed: > > If we reboot by doing "# reboot" or similar from a shell, the boot will > hang not long after cpuspeed starts. The machine freezes: ctrl-alt-del > doesn't work, and only pressing the reset button or a power cycle will > restart the machine. > > If we reboot from power-up or by pressing the reset button, there is no > hang, and the boot proceeds normally. > > Another strange thing is that only some boxes have this problem. Others, > seemingly identical, reboot just fine. We've compared the BIOS settings, > the CPU steppings, etc., and they seem to be identical. It's very odd. > Maybe we're missing a BIOS setting, but we couldn't find a difference. > > We've fixed this just by turning off the cpuspeed service. > > It took some trial and error to figure out this was caused by cpuspeed. > Misleadingly, the hang doesn't occur immediately after "Starting > cpuspeed: [OK]" prints. Instead it occurs when trying to bring up a > network interface, which is almost right after cpuspeed starting. With > the original 2.6.9-34.ELsmp, it's at "Bringing up interface eth0". With > the 2.6.9-34.0.2.ELsmp (and all other rpms updated), it hangs at > "Bringing up loopback interface". This may just be a timing thing. > > We can just forget about cpuspeed, but if any of you have any advice, > we'd appreciate it. Otherwise I am basically posting this to save > diagnostic time for those who encounter these symptoms in the future. > > These are dual-core dual Opteron 265/270 servers with Tyan K8SD Pro > motherboards. > > Thanks, > Dan Personally, I don't like cpuspeed ... and I turn it off all the time except on laptops. I have also had issues, especially on AMD machines, with cpuspeed.
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