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| author | Horst Hartmann <horsth@linux.vnet.ibm.com> | 2011-02-17 12:13:59 (GMT) |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2011-02-17 12:13:59 (GMT) |
| commit | dd30ac327481f1663b6526fa9fa078569188b7cc (patch) | |
| tree | 7e78bdbafc46bf0e70b89857c29c102676693d74 | |
| parent | 7657e41a0bd16c9d8b3cefe8fd5d6ac3c25ae4bf (diff) | |
| download | linux-dd30ac327481f1663b6526fa9fa078569188b7cc.tar.xz | |
[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>
| -rw-r--r-- | arch/s390/include/asm/cache.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/include/asm/cache.h b/arch/s390/include/asm/cache.h index 24aafa6..2a30d5a 100644 --- a/arch/s390/include/asm/cache.h +++ b/arch/s390/include/asm/cache.h @@ -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"))) |