diff options
| author | Jack Steiner <steiner@sgi.com> | 2011-08-05 09:09:00 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-08-29 14:33:01 -0700 |
| commit | 9792fdb75682aeb0d23365adf8bc4e2d7a8cb97e (patch) | |
| tree | 81d4e600618d213e90119da291c09cd796da21ac | |
| parent | 068b8e1556805d48fcfee26c61ee65a52abc4f77 (diff) | |
| download | linux-stable-9792fdb75682aeb0d23365adf8bc4e2d7a8cb97e.tar.gz | |
x86, UV: Remove UV delay in starting slave cpus
commit 05e33fc20ea5e493a2a1e7f1d04f43cdf89f83ed upstream.
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>
Link: http://lkml.kernel.org/r/20110805140900.GA6774@sgi.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | arch/x86/kernel/apic/x2apic_uv_x.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c index 21db3cbea7dc..00cf4dc5d943 100644 --- a/arch/x86/kernel/apic/x2apic_uv_x.c +++ b/arch/x86/kernel/apic/x2apic_uv_x.c @@ -139,7 +139,6 @@ 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) | |