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authorHong H. Pham <hong.pham@windriver.com>2009-06-04 05:10:11 -0400
committerDavid S. Miller <davem@davemloft.net>2009-06-16 07:56:28 -0400
commit280ff97494e0fef4124bee5c52e39b23a18dd283 (patch)
treee906ca3c5e0a6238882d181ab5b01fb3f40ba5df /arch/sparc/kernel/cpumap.h
parent4fd78a5f1edf62ab1ca3d23efee4a8a336edb2b6 (diff)
sparc64: fix and optimize irq distribution
irq_choose_cpu() should compare the affinity mask against cpu_online_map rather than CPU_MASK_ALL, since irq_select_affinity() sets the interrupt's affinity mask to cpu_online_map "and" CPU_MASK_ALL (which ends up being just cpu_online_map). The mask comparison in irq_choose_cpu() will always fail since the two masks are not the same. So the CPU chosen is the first CPU in the intersection of cpu_online_map and CPU_MASK_ALL, which is always CPU0. That means all interrupts are reassigned to CPU0... Distributing interrupts to CPUs in a linearly increasing round robin fashion is not optimal for the UltraSPARC T1/T2. Also, the irq_rover in irq_choose_cpu() causes an interrupt to be assigned to a different processor each time the interrupt is allocated and released. This may lead to an unbalanced distribution over time. A static mapping of interrupts to processors is done to optimize and balance interrupt distribution. For the T1/T2, interrupts are spread to different cores first, and then to strands within a core. The following is some benchmarks showing the effects of interrupt distribution on a T2. The test was done with iperf using a pair of T5220 boxes, each with a 10GBe NIU (XAUI) connected back to back. TCP | Stock Linear RR IRQ Optimized IRQ Streams | 2.6.30-rc5 Distribution Distribution | GBits/sec GBits/sec GBits/sec --------+----------------------------------------- 1 0.839 0.862 0.868 8 1.16 4.96 5.88 16 1.15 6.40 8.04 100 1.09 7.28 8.68 Signed-off-by: Hong H. Pham <hong.pham@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/kernel/cpumap.h')
-rw-r--r--arch/sparc/kernel/cpumap.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/sparc/kernel/cpumap.h b/arch/sparc/kernel/cpumap.h
new file mode 100644
index 000000000000..e639880ab864
--- /dev/null
+++ b/arch/sparc/kernel/cpumap.h
@@ -0,0 +1,16 @@
1#ifndef _CPUMAP_H
2#define _CPUMAP_H
3
4#ifdef CONFIG_SMP
5extern void cpu_map_rebuild(void);
6extern int map_to_cpu(unsigned int index);
7#define cpu_map_init() cpu_map_rebuild()
8#else
9#define cpu_map_init() do {} while (0)
10static inline int map_to_cpu(unsigned int index)
11{
12 return raw_smp_processor_id();
13}
14#endif
15
16#endif