grub2/0482-Reduce-timer-event-frequency-by-10.patch

From c89ce9e7afd7b6b2aba2dd83a2c1faf4cf651262 Mon Sep 17 00:00:00 2001
From: Mark Salter <msalter@redhat.com>
Date: Thu, 20 Feb 2014 12:54:52 -0500
Subject: [PATCH 482/506] Reduce timer event frequency by 10

Timer event to keep grub msec counter was running at 1000HZ. This was too
fast for UEFI timer driver and resulted in a 10x slowdown in grub time
versus wallclock. Reduce the timer event frequency and increase tick
increment accordingly to keep better time.

Signed-off-by: Mark Salter <msalter@redhat.com>
---
 grub-core/kern/arm/efi/init.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/grub-core/kern/arm/efi/init.c b/grub-core/kern/arm/efi/init.c
index 2572ca8..06df60e 100644
--- a/grub-core/kern/arm/efi/init.c
+++ b/grub-core/kern/arm/efi/init.c
@@ -38,7 +38,7 @@ static void
 increment_timer (grub_efi_event_t event __attribute__ ((unused)),
 		 void *context __attribute__ ((unused)))
 {
-  tmr++;
+  tmr += 10;
 }
 
 void
@@ -52,7 +52,7 @@ grub_machine_init (void)
 
   efi_call_5 (b->create_event, GRUB_EFI_EVT_TIMER | GRUB_EFI_EVT_NOTIFY_SIGNAL,
 	      GRUB_EFI_TPL_CALLBACK, increment_timer, NULL, &tmr_evt);
-  efi_call_3 (b->set_timer, tmr_evt, GRUB_EFI_TIMER_PERIODIC, 10000);
+  efi_call_3 (b->set_timer, tmr_evt, GRUB_EFI_TIMER_PERIODIC, 100000);
 
   grub_install_get_time_ms (grub_efi_get_time_ms);
 }
-- 
2.4.3