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Commit 05e33fc2 authored by Jack Steiner's avatar Jack Steiner Committed by Ingo Molnar
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x86, UV: Remove UV delay in starting slave cpus 



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: default avatarJack Steiner <steiner@sgi.com>
Cc: <stable@kernel.org>
Link: http://lkml.kernel.org/r/20110805140900.GA6774@sgi.com


Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent a3ea14df

arch/x86/kernel/apic/x2apic_uv_x.c

+0 −1
Original line number Diff line number Diff line
@@ -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) |