x86, UV: Remove UV delay in starting slave cpus
authorJack Steiner <steiner@sgi.com>
Fri, 5 Aug 2011 14:09:00 +0000 (09:09 -0500)
committerIngo Molnar <mingo@elte.hu>
Fri, 5 Aug 2011 21:48:34 +0000 (23:48 +0200)
Delete the 10 msec delay between the INIT and SIPI when starting
slave cpus. I can find no requirement for this delay. BIOS also
has similar code sequences without the delay.

Removing the delay reduces boot time by 40 sec. Every bit helps.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Cc: <stable@kernel.org>
Link: http://lkml.kernel.org/r/20110805140900.GA6774@sgi.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
arch/x86/kernel/apic/x2apic_uv_x.c

index adc66c3a1fef2417be8741d334d5f8460c23ff10..34b18594e72467212f0e430c329e9fa523f3aa09 100644 (file)
@@ -207,7 +207,6 @@ static int __cpuinit uv_wakeup_secondary(int phys_apicid, unsigned long start_ri
            ((start_rip << UVH_IPI_INT_VECTOR_SHFT) >> 12) |
            APIC_DM_INIT;
        uv_write_global_mmr64(pnode, UVH_IPI_INT, val);
-       mdelay(10);
 
        val = (1UL << UVH_IPI_INT_SEND_SHFT) |
            (phys_apicid << UVH_IPI_INT_APIC_ID_SHFT) |