lkml.org 
[lkml]   [2004]   [Sep]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PPC64] Improved VSID allocation algorithm
    On Thu, Sep 30, 2004 at 04:40:37PM +1000, Anton Blanchard wrote:
    >
    > > This patch went into 2.6.9-rc2-bk2, and my p640 does not boot anymore.
    > > Hangs after 'returning from prom_init', wants a power cycle.
    >
    > How much memory do you have? We might be filling up a hpte bucket
    > completely with certain amounts of memory.

    Bugger, bugger, bugger bugger. That's it. Just ran 4GB linear
    mapping with 4k pages through by hash scattering simulator - max
    bucket load is 2 with the old algo and 16 with the new one. Well, we
    just found the first case where the new algorithm scatters
    significantly worse than the old one. It would be something this
    dire, wouldn't it.

    --
    David Gibson | For every complex problem there is a
    david AT gibson.dropbear.id.au | solution which is simple, neat and
    | wrong.
    http://www.ozlabs.org/people/dgibson
    -
    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: 2005-03-22 14:06    [W:5.400 / U:1.096 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site