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SubjectRe: irq balancing: performance disaster
On Sun, 11 May 2003, Jos Hulzink wrote:

> For the Mandrake 2.4.21-0.13mdk kernel, there is no noirqbalance option in the
> kernel. I tried to contact the Mandrake guys about this, but unfortunately
> their response is 0. This patch also fails badly, and I haven't decided yet
> wether I'm willing to help a company which doesn't seem to care at all and
> uses pre-kernels in their distribution.

It was a bug in 2.4, fixed in Alan's tree by setting target_cpus to 0xff
(previously cpu_online_map). There is no noirqbalance option in 2.4
because there is no in kernel irq balancer.


Index: linux-2.4.21-pre1/include/asm-i386/smpboot.h
RCS file: /build/cvsroot/linux-2.4.19/include/asm-i386/smpboot.h,v
retrieving revision 1.2
diff -u -p -B -r1.2 smpboot.h
--- linux-2.4.21-pre1/include/asm-i386/smpboot.h 8 Mar 2003 21:54:33 -0000 1.2
+++ linux-2.4.21-pre1/include/asm-i386/smpboot.h 10 Apr 2003 11:19:05 -0000
@@ -116,6 +116,6 @@ static inline int target_cpus(void)
return cpu_online_map;
-#define target_cpus() (cpu_online_map)
+#define target_cpus() (0xFF)
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