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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Mark Salter <msalter@redhat.com>
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Date: Thu, 20 Feb 2014 12:54:52 -0500
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Subject: [PATCH] Reduce timer event frequency by 10
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Timer event to keep grub msec counter was running at 1000HZ. This was too
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fast for UEFI timer driver and resulted in a 10x slowdown in grub time
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versus wallclock. Reduce the timer event frequency and increase tick
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increment accordingly to keep better time.
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Signed-off-by: Mark Salter <msalter@redhat.com>
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---
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grub-core/kern/arm/efi/init.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/grub-core/kern/arm/efi/init.c b/grub-core/kern/arm/efi/init.c
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index a6ae03475cc..0c17d8390fa 100644
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--- a/grub-core/kern/arm/efi/init.c
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+++ b/grub-core/kern/arm/efi/init.c
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@@ -38,7 +38,7 @@ static void
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increment_timer (grub_efi_event_t event __attribute__ ((unused)),
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void *context __attribute__ ((unused)))
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{
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- tmr++;
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+ tmr += 10;
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}
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void
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@@ -52,7 +52,7 @@ grub_machine_init (void)
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efi_call_5 (b->create_event, GRUB_EFI_EVT_TIMER | GRUB_EFI_EVT_NOTIFY_SIGNAL,
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GRUB_EFI_TPL_CALLBACK, increment_timer, NULL, &tmr_evt);
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- efi_call_3 (b->set_timer, tmr_evt, GRUB_EFI_TIMER_PERIODIC, 10000);
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+ efi_call_3 (b->set_timer, tmr_evt, GRUB_EFI_TIMER_PERIODIC, 100000);
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grub_install_get_time_ms (grub_efi_get_time_ms);
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}
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