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    Subject[patch] i386, numaq: enable TSCs again

    Andi, Andrew, do you remember why we disabled TSCs on NUMAQ? It was
    slightly async between CPUs, right? In that case we should try the patch


    Subject: [patch] i386, numaq: enable TSCs again
    From: Ingo Molnar <>

    enable TSCs on NUMAQ again. sched_clock() got improved and
    the scheduler treats it as a per-CPU clock, so there should
    be no issues from the slightly async TSCs on NUMAQ. Please
    holler if this is wrong ...

    Signed-off-by: Ingo Molnar <>
    arch/i386/kernel/numaq.c | 3 +--
    1 file changed, 1 insertion(+), 2 deletions(-)

    Index: linux-cfs-2.6.22-rc2-mm1.q/arch/i386/kernel/numaq.c
    --- linux-cfs-2.6.22-rc2-mm1.q.orig/arch/i386/kernel/numaq.c
    +++ linux-cfs-2.6.22-rc2-mm1.q/arch/i386/kernel/numaq.c
    @@ -81,8 +81,7 @@ int __init get_memcfg_numaq(void)
    static int __init numaq_tsc_disable(void)
    if (num_online_nodes() > 1) {
    - printk(KERN_DEBUG "NUMAQ: disabling TSC\n");
    - tsc_disable = 1;
    + printk(KERN_DEBUG "NUMAQ: NOT disabling TSC. System still ok?\n");
    return 0;
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      Last update: 2007-05-25 10:11    [W:0.021 / U:12.764 seconds]
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