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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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