1 files changed, 45 insertions, 0 deletions

diff --git a/patches/boot_time_opt_guest/0108-smpboot-reuse-timer-calibration.patch b/patches/boot_time_opt_guest/0108-smpboot-reuse-timer-calibration.patch
new file mode 100644
index 0000000..48be94a
--- /dev/null
+++ b/patches/boot_time_opt_guest/0108-smpboot-reuse-timer-calibration.patch
@@ -0,0 +1,45 @@
+From 634947be6c24d844af5f6ecf59453f2ddc09e032 Mon Sep 17 00:00:00 2001
+From: Arjan van de Ven <arjan@linux.intel.com>
+Date: Wed, 11 Feb 2015 17:28:14 -0600
+Subject: [PATCH 108/114] smpboot: reuse timer calibration
+
+NO point recalibrating for known-constant tsc... saves 200ms+ of boot time.
+
+Author:    Arjan van de Ven <arjan@linux.intel.com>
+
+Signed-off-by: Miguel Bernal Marin <miguel.bernal.marin@linux.intel.com>
+---
+ arch/x86/kernel/smpboot.c | 2 +-
+ arch/x86/kernel/tsc.c     | 3 +++
+ 2 files changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
+index 99b920d0e516..e17bb425bb52 100644
+--- a/arch/x86/kernel/smpboot.c
++++ b/arch/x86/kernel/smpboot.c
+@@ -761,7 +761,7 @@ wakeup_secondary_cpu_via_init(int phys_apicid, unsigned long start_eip)
+        pr_debug("Waiting for send to finish...\n");
+        send_status = safe_apic_wait_icr_idle();
+ 
+-       udelay(init_udelay);
++       udelay(100);
+ 
+        pr_debug("Deasserting INIT\n");
+ 
+diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
+index 37e7cf544e51..e99be8a6a132 100644
+--- a/arch/x86/kernel/tsc.c
++++ b/arch/x86/kernel/tsc.c
+@@ -1413,6 +1413,9 @@ unsigned long calibrate_delay_is_known(void)
+        if (!mask)
+                return 0;
+ 
++       if (cpu !=0)
++               return cpu_data(0).loops_per_jiffy;
++
+        sibling = cpumask_any_but(mask, cpu);
+        if (sibling < nr_cpu_ids)
+                return cpu_data(sibling).loops_per_jiffy;
+-- 
+2.11.1
+