[CentOS] Uneven CPU speed with CentOS 4.4 on a Mac Pro
Michael Lampe
Michael.Lampe at iwr.uni-heidelberg.deMon Oct 16 14:54:00 UTC 2006
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Hi list, I've recently managed to install CentOS 4.4 on an Apple Mac Pro. Functionality-wise everything works great, but when trying to benchmark the system, I don't get stable runtimes, they differ by more than 30%. For example a benchmark run with our PDE solving code takes between 500 and 800 s on the completely unloaded machine. Suspicious kernel output (complete output attached): PCI: Probing PCI hardware (bus 00) PCI: 0000:00:03.0: class 600 doesn't match header type 01. Ignoring class. PCI: 0000:00:05.0: class 600 doesn't match header type 01. Ignoring class. PCI: 0000:00:06.0: class 600 doesn't match header type 01. Ignoring class. PCI: 0000:00:07.0: class 600 doesn't match header type 01. Ignoring class. and quite a bunch of APIC error on CPUx: 60(60). This is probably due to Apple's not quite perfect BIOS emulation code. According to /proc/cpuinfo the CPUs don't support any power managment, cpuspeed isn't running or even configured, and they are always shown as 2.66 GHz, which is correct. Anyone any idea? -Michael -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: dmesg URL: <http://lists.centos.org/pipermail/centos/attachments/20061016/aedae281/attachment.ksh>
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