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    SubjectRe: 2.6.14-rc2-mm1
    On Sun, 25 Sep 2005, Paul Blazejowski wrote:

    > Upon quick testing the latest mm kernel it appears there's some kind of
    > race condition when using dual core cpu esp when using XORG and USB
    > (although PS2 has same issue) kebyboard rate being too fast.

    Does the following patch by John Stultz fix the problem?

    Tim


    From johnstul@us.ibm.com Mon Sep 26 09:04:08 2005
    Date: Mon, 19 Sep 2005 12:16:43 -0700
    From: john stultz <johnstul@us.ibm.com>
    To: Andrew Morton <akpm@osdl.org>
    Cc: lkml <linux-kernel@vger.kernel.org>, Andi Kleen <ak@suse.de>
    Subject: [PATCH] x86-64: Fix bad assumption that dualcore cpus have synced
    TSCs

    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;

    -
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