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[S390] net: provide architecture specific NET_SKB_PAD 

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>
This commit is contained in:
Horst Hartmann 2011-02-17 13:13:59 +01:00 committed by Martin Schwidefsky
parent 7657e41a0b
commit dd30ac3274
1 changed files with 1 additions and 0 deletions
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arch/s390/include/asm/cache.h
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@ -13,6 +13,7 @@
#define L1_CACHE_BYTES 256
#define L1_CACHE_SHIFT 8
#define NET_SKB_PAD 32
#define __read_mostly __attribute__((__section__(".data..read_mostly")))