On Tue, Jul 29, 2008 at 05:19:22PM +0200, Bastian Blank wrote:
> On Tue, Jul 29, 2008 at 07:48:11AM -0700, Mike Travis wrote:
> > You could look at the 2.6.27 version of include/asm-x86/irq_vectors.h to see
> > how NR_IRQ's is somewhat lessened (at least from a NR_CPUS=4096
> > perspective.)
> May this change be applicable to 2.6.26 or will it break something else?
Aka something like:
diff --git a/include/asm-x86/irq_64.h b/include/asm-x86/irq_64.h
index 083d35a..30e1a6b 100644
--- a/include/asm-x86/irq_64.h
+++ b/include/asm-x86/irq_64.h
@@ -31,8 +31,22 @@
#define FIRST_SYSTEM_VECTOR 0xef /* duplicated in hw_irq.h */
-#define NR_IRQS (NR_VECTORS + (32 * NR_CPUS))
-#define NR_IRQ_VECTORS NR_IRQS
+#if defined(CONFIG_X86_IO_APIC) || defined(CONFIG_PARAVIRT) ||
defined(CONFIG_X86_VISWS)
+
+# define NR_IRQS 224
+
+# if (224 >= 32 * NR_CPUS)
+# define NR_IRQ_VECTORS NR_IRQS
+# else
+# define NR_IRQ_VECTORS (32 * NR_CPUS)
+# endif
+
+#else /* IO_APIC || PARAVIRT */
+
+# define NR_IRQS 16
+# define NR_IRQ_VECTORS NR_IRQS
+
+#endif
static inline int irq_canonicalize(int irq)
{
Which produces (with 255 cpus):
text data bss dec hex filename
3532199 505256 610456 4647911 46ebe7 vmlinux
Bastian
--
It would be illogical to kill without reason.
-- Spock, "Journey to Babel", stardate 3842.4
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