This is a note to let you know that I've just added the patch titled
x86, UV: Remove UV delay in starting slave cpus
to the 2.6.32-longterm tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/longterm/longterm-queue-2.6.32.git;a=summary
The filename of the patch is:
x86-uv-remove-uv-delay-in-starting-slave-cpus.patch
and it can be found in the queue-2.6.32 subdirectory.
If you, or anyone else, feels it should not be added to the 2.6.32 longterm
tree,
please let <sta...@kernel.org> know about it.
>From 05e33fc20ea5e493a2a1e7f1d04f43cdf89f83ed Mon Sep 17 00:00:00 2001
From: Jack Steiner <stei...@sgi.com>
Date: Fri, 5 Aug 2011 09:09:00 -0500
Subject: x86, UV: Remove UV delay in starting slave cpus
From: Jack Steiner <stei...@sgi.com>
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 <stei...@sgi.com>
Link: http://lkml.kernel.org/r/20110805140900.ga6...@sgi.com
Signed-off-by: Ingo Molnar <mi...@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gre...@suse.de>
---
arch/x86/kernel/apic/x2apic_uv_x.c | 1 -
1 file changed, 1 deletion(-)
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -117,7 +117,6 @@ static int __cpuinit uv_wakeup_secondary
((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) |
Patches currently in longterm-queue-2.6.32 which might be from stei...@sgi.com
are
/home/gregkh/linux/longterm/longterm-queue-2.6.32/queue-2.6.32/x86-uv-remove-uv-delay-in-starting-slave-cpus.patch
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