Index: sys/x86/x86/msi.c
===================================================================
--- sys/x86/x86/msi.c
+++ sys/x86/x86/msi.c
@@ -56,6 +56,7 @@
 #include <machine/md_var.h>
 #include <machine/frame.h>
 #include <machine/intr_machdep.h>
+#include <machine/param.h>
 #include <x86/apicvar.h>
 #include <x86/iommu/iommu_intrmap.h>
 #include <machine/specialreg.h>
@@ -156,7 +157,7 @@
 SYSCTL_UINT(_machdep, OID_AUTO, first_msi_irq, CTLFLAG_RD, &first_msi_irq, 0,
     "Number of first IRQ reserved for MSI and MSI-X interrupts");
 
-u_int num_msi_irqs = 2048;
+u_int num_msi_irqs = MAXCPU * 8;
 SYSCTL_UINT(_machdep, OID_AUTO, num_msi_irqs, CTLFLAG_RDTUN, &num_msi_irqs, 0,
     "Number of IRQs reserved for MSI and MSI-X interrupts");