rpms/kernel/FC-5 linux-2.6-x86_64-c3-timer-latency.patch, NONE, 1.1 kernel-2.6.spec, 1.2218, 1.2219

Mon Oct 30 05:21:15 UTC 2006

Author: davej

Update of /cvs/dist/rpms/kernel/FC-5
In directory cvs.devel.redhat.com:/tmp/cvs-serv11651

Modified Files:
	kernel-2.6.spec 
Added Files:
	linux-2.6-x86_64-c3-timer-latency.patch 
Log Message:
x86_64: Fix up C3 timer latency.

linux-2.6-x86_64-c3-timer-latency.patch:
 time.c |    3 +--
 1 files changed, 1 insertion(+), 2 deletions(-)

--- NEW FILE linux-2.6-x86_64-c3-timer-latency.patch ---
>From davej  Sat Oct 21 18:52:54 2006
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From:	Andi Kleen <ak at suse.de>
References: <200610221250.493223000 at suse.de>
In-Reply-To: <200610221250.493223000 at suse.de>
To:	patches at x86-64.org, linux-kernel at vger.kernel.org
Subject: [PATCH] [1/2] x86_64: Fix C3 timer test
Message-Id: <20061021225052.9395013B62 at wotan.suse.de>
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There was a typo in the C3 latency test to decide of the TSC
should be used or not. It used the C2 latency threshold, not the
C3 one. Fix that.

This should fix the time on various dual core laptops.

Signed-off-by: Andi Kleen <ak at suse.de>

---
 arch/x86_64/kernel/time.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

Index: linux/arch/x86_64/kernel/time.c
===================================================================
--- linux.orig/arch/x86_64/kernel/time.c
+++ linux/arch/x86_64/kernel/time.c
@@ -948,7 +948,7 @@ __cpuinit int unsynchronized_tsc(void)
  	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) {
 #ifdef CONFIG_ACPI
 		/* But TSC doesn't tick in C3 so don't use it there */
-		if (acpi_fadt.length > 0 && acpi_fadt.plvl3_lat < 100)
+		if (acpi_fadt.length > 0 && acpi_fadt.plvl3_lat < 1000)
 			return 1;
 #endif
  		return 0;
-
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Index: kernel-2.6.spec
===================================================================
RCS file: /cvs/dist/rpms/kernel/FC-5/kernel-2.6.spec,v
retrieving revision 1.2218
retrieving revision 1.2219
diff -u -r1.2218 -r1.2219
--- kernel-2.6.spec	30 Oct 2006 05:13:44 -0000	1.2218
+++ kernel-2.6.spec	30 Oct 2006 05:21:13 -0000	1.2219
@@ -255,6 +255,7 @@
 Patch207: linux-2.6-x86_64-tif-restore-sigmask.patch
 Patch208: linux-2.6-x86_64-add-ppoll-pselect.patch
 Patch211: linux-2.6-x86-unwinder-fixes.patch
+Patch212: linux-2.6-x86_64-c3-timer-latency.patch
 
 # 300 - 399   ppc(64)
 Patch300: linux-2.6-ppc-dac960-ipr-clash.patch
@@ -740,6 +741,8 @@
 %patch208 -p1
 # DWARF2 unwinder fixes.
 %patch211 -p1
+# Fix up C3 timer latency.
+%patch212 -p1
 
 #
 # PowerPC
@@ -1641,6 +1644,7 @@
 * Sun Oct 29 2006 Dave Jones <davej at redhat.com>
 - More ext3 robustness fixes.
 - Include more verbose BUG() data
+- x86_64: Fix up C3 timer latency.
 
 * Sat Oct 21 2006 Dave Jones <davej at redhat.com> 
 - Reenable NCPFS (#211325, #203663)


