Hi!
It is bad idea to use tsc in case apm is messing with speeds.
BTW I do't like idea of clearing bits in feature: cpu _has_ that
feature, it is just that linux refuses to use it.
Pavel
--- clean/arch/i386/kernel/setup.c Wed Jul 12 21:02:29 2000
+++ linux/arch/i386/kernel/setup.c Sun Jul 23 22:27:47 2000
@@ -1594,6 +1594,7 @@
int i, n;
for (n = 0; n < NR_CPUS; n++, c++) {
+ extern int use_tsc;
#ifdef CONFIG_SMP
if (!(cpu_online_map & (1<<n)))
continue;
@@ -1676,6 +1677,7 @@
"fpu_exception\t: %s\n"
"cpuid level\t: %d\n"
"wp\t\t: %s\n"
+ "use_tsc\t\t: %s\n"
"flags\t\t:",
c->fdiv_bug ? "yes" : "no",
c->hlt_works_ok ? "no" : "yes",
@@ -1685,7 +1687,8 @@
c->hard_math ? "yes" : "no",
(c->hard_math && ignore_irq13) ? "yes" : "no",
c->cpuid_level,
- c->wp_works_ok ? "yes" : "no");
+ c->wp_works_ok ? "yes" : "no",
+ use_tsc ? "yes" : "no");
for ( i = 0 ; i < 32 ; i++ )
if ( c->x86_capability & (1 << i) )
@@ -1731,6 +1734,9 @@
if (cpu_has_vme || cpu_has_tsc || cpu_has_de)
clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE);
+#ifdef CONFIG_APM_CPU_IDLE
+ tsc_disable = 1;
+#endif
#ifndef CONFIG_X86_TSC
if (tsc_disable && cpu_has_tsc) {
printk("Disabling TSC...\n");
-- I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care." Panos Katsaloulis describing me w.r.t. patents at discuss@linmodems.org- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Sun Jul 23 2000 - 21:00:20 EST