D29942.id88176.diff
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	Index: sys/x86/x86/local_apic.c
	===================================================================
	--- sys/x86/x86/local_apic.c
	+++ sys/x86/x86/local_apic.c
	@@ -202,6 +202,7 @@
	static struct eventtimer lapic_et;
	#ifdef SMP
	static uint64_t lapic_ipi_wait_mult;
	+static int lapic_ipi_timeout = 1000000;
	#endif
	unsigned int max_apic_id;

	@@ -212,6 +213,10 @@
	&lapic_eoi_suppression, 0, "");
	SYSCTL_INT(_hw_apic, OID_AUTO, timer_tsc_deadline, CTLFLAG_RD,
	&lapic_timer_tsc_deadline, 0, "");
	+#ifdef SMP
	+SYSCTL_INT(_hw_apic, OID_AUTO, ipi_timeout, CTLFLAG_RWTUN, &lapic_ipi_timeout,
	+ 0, "timeout (microseconds) for IPI to be sent");
	+#endif

	static void lapic_calibrate_initcount(struct lapic *la);
	static void lapic_calibrate_deadline(struct lapic *la);
	@@ -2035,7 +2040,6 @@
	}
	}

	-#define BEFORE_SPIN 50000
	#ifdef DETECT_DEADLOCK
	#define AFTER_SPIN 50
	#endif
	@@ -2082,7 +2086,7 @@
	icrlo \|= APIC_DESTMODE_PHY \| APIC_TRIGMOD_EDGE \| APIC_LEVEL_ASSERT;

	/* Wait for an earlier IPI to finish. */
	- if (!lapic_ipi_wait(BEFORE_SPIN)) {
	+ if (!lapic_ipi_wait(lapic_ipi_timeout)) {
	if (KERNEL_PANICKED())
	return;
	else