lkml.org 
[lkml]   [2005]   [Sep]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Subject[PATCH] x86-64: Fix bad assumption that dualcore cpus have synced TSCs
    From
    Date
    Andrew,
    This patch should resolve the issue seen in bugme bug #5105, where it
    is assumed that dualcore x86_64 systems have synced TSCs. This is not
    the case, and alternate timesources should be used instead.

    For more details, see:
    http://bugzilla.kernel.org/show_bug.cgi?id=5105


    Please consider for inclusion in your tree.

    thanks
    -john

    diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c
    --- a/arch/x86_64/kernel/time.c
    +++ b/arch/x86_64/kernel/time.c
    @@ -959,9 +959,6 @@ static __init int unsynchronized_tsc(voi
    are handled in the OEM check above. */
    if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
    return 0;
    - /* All in a single socket - should be synchronized */
    - if (cpus_weight(cpu_core_map[0]) == num_online_cpus())
    - return 0;
    #endif
    /* Assume multi socket systems are not synchronized */
    return num_online_cpus() > 1;

    -
    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: 2005-09-19 21:20    [W:2.361 / U:1.528 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site