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-rw-r--r--include/asm-ia64/shmparam.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/asm-ia64/shmparam.h b/include/asm-ia64/shmparam.h
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+++ b/include/asm-ia64/shmparam.h
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+#ifndef _ASM_IA64_SHMPARAM_H
+#define _ASM_IA64_SHMPARAM_H
+
+/*
+ * SHMLBA controls minimum alignment at which shared memory segments
+ * get attached. The IA-64 architecture says that there may be a
+ * performance degradation when there are virtual aliases within 1MB.
+ * To reduce the chance of this, we set SHMLBA to 1MB. --davidm 00/12/20
+ */
+#define SHMLBA (1024*1024)
+
+#endif /* _ASM_IA64_SHMPARAM_H */