Help with improving mysql performance on 6.2PRE
kris at obsecurity.org
Fri Oct 13 13:13:59 PDT 2006
On Fri, Oct 13, 2006 at 11:49:04AM -0700, Chuck Swiger wrote:
> On Oct 13, 2006, at 11:26 AM, Eric Hodel wrote:
> >>>Or did that change recently?
> >>It's only on certain systems, apparently.
> >Is there a list of systems where it is safe to use the TSC with
> >SMP? Or some script we can run?
> The problem of the TSC clocks getting out of sync affects pretty much
> all AMD X2 dual-core CPUs, as well as the older 32-bit Althon MP
> CPUs; the Intel Xeon and Core Duo CPUs seem to do a lot better,
> although older Intel CPUs have also been reported to show problems
> with the TSC.
> Disabling the fancy power-management capabilities (SpeedStep,
> PowerNow, Cool-n-quiet) to prevent the system from adjusting the CPU
> clock frequencies seems to reduce the extent of the problem.
> However, if you want your system clock to work reliably, using the
> ACPI-safe or i8254 timecounters is going to do much better than using
> the faster-but-unreliable TSC method.
Beyond that, just see if it works ;-)
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