grub2/0051-Reduce-timer-event-frequency-by-10.patch

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From 37395693e758b0674a6d504c9672b290eaa172bd Mon Sep 17 00:00:00 2001
From: Mark Salter <msalter@redhat.com>
Date: Thu, 20 Feb 2014 12:54:52 -0500
Subject: [PATCH 51/74] 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