Comment 5 for bug 190414

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Stéphan Kochen (stephank) wrote : Re: [hardy] Abnormal time to access ata devices at boot

I'm seeing a similar problem on a NEC Versa P550, but it actually turns out to be the TSC clock source that's causing the trouble in my case.

Right after that "Clocksource tsc unstable" message in your dmesg output, you'll notice the kernel detects the problem and switches to another clock source:
"Time: hpet clocksource has been installed."

You can tell it to use the HPET clocksource from the start by adding "clocksource=hpet" to your kernel command line. The kernel command line is specified in /boot/grub/menu.lst at the line starting with "# kopt=...".

See if that fixes your problem. :)