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NET_SKB_PAD has been increased from 32 to 64 and later to max(32, L1_CACHE_BYTES). This led to a 25% throughput decrease for streaming workloads accompanied by a 37% CPU cost increase on s390. Define a architecture specific NET_SKB_PAD with the old value of 32. Signed-off-by: Horst Hartmann <horsth@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
21 lines
445 B
C
21 lines
445 B
C
/*
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* include/asm-s390/cache.h
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*
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* S390 version
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* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
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*
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* Derived from "include/asm-i386/cache.h"
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* Copyright (C) 1992, Linus Torvalds
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*/
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#ifndef __ARCH_S390_CACHE_H
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#define __ARCH_S390_CACHE_H
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#define L1_CACHE_BYTES 256
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#define L1_CACHE_SHIFT 8
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#define NET_SKB_PAD 32
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#define __read_mostly __attribute__((__section__(".data..read_mostly")))
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#endif
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