lkml.org 
[lkml]   [2005]   [Jun]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: 2.6.12-mm1 boot failure on NUMA box.

    * Martin J. Bligh <mbligh@mbligh.org> 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
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-06-24 22:00    [W:0.020 / U:1.084 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site