[RFC] [PATCH] Disable TSCs on CONFIG_MULTIQUAD

john stultz
2002-05-29T20:44:25Z

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Hi all,
Just wanted to submit this for comments. As we've been having trouble
keeping the TSCs on NUMA hardware synced (resulting in gettimeofday
occasionally going backward), this patch (against 2.4.18) disables TSCs
if CONFIG_MULTIQUAD is enabled. Any suggestions for simplifying the
changes to config.in would be appreciated.

Flames/etc also welcome.
-john

[-- Attachment #2: tsc-disable_A2.patch --]
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Index: linux24/arch/i386/config.in
diff -u linux24/arch/i386/config.in:1.1.1.3 linux24/arch/i386/config.in:1.1.1.3.14.2
--- linux24/arch/i386/config.in:1.1.1.3 Wed Feb 13 14:53:47 2002
+++ linux24/arch/i386/config.in Wed May 29 10:59:43 2002
@@ -80,20 +80,20 @@
define_int CONFIG_X86_L1_CACHE_SHIFT 5
define_bool CONFIG_X86_USE_STRING_486 y
define_bool CONFIG_X86_ALIGNMENT_16 y
- define_bool CONFIG_X86_TSC y
+ define_bool CONFIG_X86_HAS_TSC y
define_bool CONFIG_X86_PPRO_FENCE y
fi
if [ "$CONFIG_M586MMX" = "y" ]; then
define_int CONFIG_X86_L1_CACHE_SHIFT 5
define_bool CONFIG_X86_USE_STRING_486 y
define_bool CONFIG_X86_ALIGNMENT_16 y
- define_bool CONFIG_X86_TSC y
+ define_bool CONFIG_X86_HAS_TSC y
define_bool CONFIG_X86_GOOD_APIC y
define_bool CONFIG_X86_PPRO_FENCE y
fi
if [ "$CONFIG_M686" = "y" ]; then
define_int CONFIG_X86_L1_CACHE_SHIFT 5
- define_bool CONFIG_X86_TSC y
+ define_bool CONFIG_X86_HAS_TSC y
define_bool CONFIG_X86_GOOD_APIC y
define_bool CONFIG_X86_PGE y
define_bool CONFIG_X86_USE_PPRO_CHECKSUM y
@@ -101,14 +101,14 @@
fi
if [ "$CONFIG_MPENTIUMIII" = "y" ]; then
define_int CONFIG_X86_L1_CACHE_SHIFT 5
- define_bool CONFIG_X86_TSC y
+ define_bool CONFIG_X86_HAS_TSC y
define_bool CONFIG_X86_GOOD_APIC y
define_bool CONFIG_X86_PGE y
define_bool CONFIG_X86_USE_PPRO_CHECKSUM y
fi
if [ "$CONFIG_MPENTIUM4" = "y" ]; then
define_int CONFIG_X86_L1_CACHE_SHIFT 7
- define_bool CONFIG_X86_TSC y
+ define_bool CONFIG_X86_HAS_TSC y
define_bool CONFIG_X86_GOOD_APIC y
define_bool CONFIG_X86_PGE y
define_bool CONFIG_X86_USE_PPRO_CHECKSUM y
@@ -116,12 +116,12 @@
if [ "$CONFIG_MK6" = "y" ]; then
define_int CONFIG_X86_L1_CACHE_SHIFT 5
define_bool CONFIG_X86_ALIGNMENT_16 y
- define_bool CONFIG_X86_TSC y
+ define_bool CONFIG_X86_HAS_TSC y
define_bool CONFIG_X86_USE_PPRO_CHECKSUM y
fi
if [ "$CONFIG_MK7" = "y" ]; then
define_int CONFIG_X86_L1_CACHE_SHIFT 6
- define_bool CONFIG_X86_TSC y
+ define_bool CONFIG_X86_HAS_TSC y
define_bool CONFIG_X86_GOOD_APIC y
define_bool CONFIG_X86_USE_3DNOW y
define_bool CONFIG_X86_PGE y
@@ -134,14 +134,14 @@
fi
if [ "$CONFIG_MCYRIXIII" = "y" ]; then
define_int CONFIG_X86_L1_CACHE_SHIFT 5
- define_bool CONFIG_X86_TSC y
+ define_bool CONFIG_X86_HAS_TSC y
define_bool CONFIG_X86_ALIGNMENT_16 y
define_bool CONFIG_X86_USE_3DNOW y
define_bool CONFIG_X86_USE_PPRO_CHECKSUM y
fi
if [ "$CONFIG_MCRUSOE" = "y" ]; then
define_int CONFIG_X86_L1_CACHE_SHIFT 5
- define_bool CONFIG_X86_TSC y
+ define_bool CONFIG_X86_HAS_TSC y
fi
if [ "$CONFIG_MWINCHIPC6" = "y" ]; then
define_int CONFIG_X86_L1_CACHE_SHIFT 5
@@ -152,14 +152,14 @@
if [ "$CONFIG_MWINCHIP2" = "y" ]; then
define_int CONFIG_X86_L1_CACHE_SHIFT 5
define_bool CONFIG_X86_ALIGNMENT_16 y
- define_bool CONFIG_X86_TSC y
+ define_bool CONFIG_X86_HAS_TSC y
define_bool CONFIG_X86_USE_PPRO_CHECKSUM y
define_bool CONFIG_X86_OOSTORE y
fi
if [ "$CONFIG_MWINCHIP3D" = "y" ]; then
define_int CONFIG_X86_L1_CACHE_SHIFT 5
define_bool CONFIG_X86_ALIGNMENT_16 y
- define_bool CONFIG_X86_TSC y
+ define_bool CONFIG_X86_HAS_TSC y
define_bool CONFIG_X86_USE_PPRO_CHECKSUM y
define_bool CONFIG_X86_OOSTORE y
fi
@@ -196,6 +196,16 @@
fi
else
bool 'Multiquad NUMA system' CONFIG_MULTIQUAD
+fi
+
+if [ "$CONFIG_X86_HAS_TSC" = "y" ]; then
+ if [ "$CONFIG_MULTIQUAD" = "y" ]; then
+ define_bool CONFIG_X86_TSC n
+ else
+ define_bool CONFIG_X86_TSC y
+ fi
+else
+ define_bool CONFIG_X86_TSC n
fi

if [ "$CONFIG_SMP" = "y" -a "$CONFIG_X86_CMPXCHG" = "y" ]; then
Index: linux24/arch/i386/kernel/setup.c
diff -u linux24/arch/i386/kernel/setup.c:1.1.1.3.14.1 linux24/arch/i386/kernel/setup.c:1.1.1.3.14.3
--- linux24/arch/i386/kernel/setup.c:1.1.1.3.14.1 Tue May 28 17:30:29 2002
+++ linux24/arch/i386/kernel/setup.c Wed May 29 10:59:43 2002
@@ -1054,7 +1054,11 @@

#ifndef CONFIG_X86_TSC
+#ifdef CONFIG_MULTIQUAD /*MULTIQUAD & TSCs don't play well*/
+static int tsc_disable __initdata = 1;
+#else /*CONFIG_MULTIQUAD*/
static int tsc_disable __initdata = 0;
+#endif /*CONFIG_MULTIQUAD*/

static int __init tsc_setup(char *str)
{