Messages in this thread Patch in this message | | | Subject | [RFC] [PATCH] Disable TSCs on CONFIG_MULTIQUAD | From | john stultz <> | Date | 29 May 2002 13:40:50 -0700 |
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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 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) { | |