From: Anton Blanchard <anton@samba•org>
To: mingo@elte•hu, peterz@infradead•org, benh@kernel•crashing.org
Cc: linuxppc-dev@lists•ozlabs.org, linux-kernel@vger•kernel.org
Subject: [PATCH 3/5] powerpc/numa: Increase SD_NODES_PER_DOMAIN to 32.
Date: Mon, 25 Jul 2011 12:33:14 +1000 [thread overview]
Message-ID: <20110725023426.218116288@samba.org> (raw)
In-Reply-To: 20110725023311.175792493@samba.org
The largest POWER7 boxes have 32 nodes. SD_NODES_PER_DOMAIN groups
nodes into chunks of 16 and adds a global balancing domain
(SD_ALLNODES) above it.
If we bump SD_NODES_PER_DOMAIN to 32, then we avoid this extra
level of balancing on our largest boxes.
Signed-off-by: Anton Blanchard <anton@samba•org>
---
Index: linux-2.6-work/arch/powerpc/include/asm/topology.h
===================================================================
--- linux-2.6-work.orig/arch/powerpc/include/asm/topology.h 2011-07-25 11:43:24.954093179 +1000
+++ linux-2.6-work/arch/powerpc/include/asm/topology.h 2011-07-25 11:43:31.274205122 +1000
@@ -28,6 +28,12 @@ struct device_node;
*/
#define RECLAIM_DISTANCE 10
+/*
+ * Avoid creating an extra level of balancing (SD_ALLNODES) on the largest
+ * POWER7 boxes which have a maximum of 32 nodes.
+ */
+#define SD_NODES_PER_DOMAIN 32
+
#include <asm/mmzone.h>
static inline int cpu_to_node(int cpu)
next prev parent reply other threads:[~2011-07-25 2:33 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-25 2:33 [PATCH 0/5] ppc64 scheduler fixes Anton Blanchard
2011-07-25 2:33 ` [PATCH 1/5] powerpc/numa: Enable SD_WAKE_AFFINE in node definition Anton Blanchard
2011-07-25 2:33 ` [PATCH 2/5] sched: Allow SD_NODES_PER_DOMAIN to be overridden Anton Blanchard
2011-07-25 2:33 ` Anton Blanchard [this message]
2011-07-25 2:33 ` [PATCH 4/5] powerpc/numa: Disable NEWIDLE balancing at node level Anton Blanchard
2011-07-25 2:33 ` [PATCH 5/5] powerpc/numa: Remove duplicate RECLAIM_DISTANCE definition Anton Blanchard
2011-07-25 12:41 ` [PATCH 0/5] ppc64 scheduler fixes Peter Zijlstra
2011-09-20 0:19 ` Anton Blanchard
2011-09-20 1:38 ` Benjamin Herrenschmidt
2011-09-20 8:07 ` Peter Zijlstra
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