* Martin J. Bligh <[email protected]> wrote:
> > - /*
> > - * In the NUMA case we dont use the TSC as they are not
> > - * synchronized across all CPUs.
> > - */
> > -#ifndef CONFIG_NUMA
> > - if (!use_tsc)
> > -#endif
> > + if (!cpu_has_tsc)
> > /* no locking but a rare wrong value is not a big deal */
> > return jiffies_64 * (1000000000 / HZ);
>
> Humpf. That does look dangerous on a NUMA-Q. The TSCs aren't synced,
> and we can't use them .... have to use PIT, whether the CPUs have TSC
> or not.
is the only problem the unsyncedness? That should be fine as far as the
scheduler is concerned. (we compensate for per-CPU drifts)
Ingo
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