i386: identifycpu(): only calibrate_cyclecounter() on primary CPU

On i386 during identifycpu(), we call calibrate_cyclecounter() for every
CPU in the system.  This is pointless: every new call clobbers the cpuspeed
measured during the prior call.  It is also extremely slow: every call to
calibrate_cyclecounter() takes about 1 second.

Instead, let's only call calibrate_cyclecounter() once, on the primary CPU.
Multiprocessor i386 machines will now boot much faster.

ok deraadt@

diff --git a/sys/arch/i386/i386/machdep.c b/sys/arch/i386/i386/machdep.c
index bbf2147..708893b 100644 (file)
--- a/sys/arch/i386/i386/machdep.c
+++ b/sys/arch/i386/i386/machdep.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: machdep.c,v 1.659 2023/01/10 00:49:45 cheloha Exp $   */
+/*     $OpenBSD: machdep.c,v 1.660 2023/01/10 01:01:18 cheloha Exp $   */
 /*     $NetBSD: machdep.c,v 1.214 1996/11/10 03:16:17 thorpej Exp $    */
 
 /*-
@@ -1861,7 +1861,8 @@ identifycpu(struct cpu_info *ci)
                        }
                        break;
                }
-               calibrate_cyclecounter();
+               if (CPU_IS_PRIMARY(ci))
+                       calibrate_cyclecounter();       /* set cpuspeed */
        }
 
        if (cpuid_level != -1)