diff options
| author | Horst Hartmann <horsth@linux.vnet.ibm.com> | 2011-02-17 07:13:59 -0500 |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2011-02-17 07:13:59 -0500 |
| commit | dd30ac327481f1663b6526fa9fa078569188b7cc (patch) | |
| tree | 7e78bdbafc46bf0e70b89857c29c102676693d74 /arch/s390 | |
| parent | 7657e41a0bd16c9d8b3cefe8fd5d6ac3c25ae4bf (diff) | |
[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>
Diffstat (limited to 'arch/s390')
| -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 24aafa68b643..2a30d5ac0667 100644 --- a/arch/s390/include/asm/cache.h +++ b/arch/s390/include/asm/cache.h | |||
| @@ -13,6 +13,7 @@ | |||
| 13 | 13 | ||
| 14 | #define L1_CACHE_BYTES 256 | 14 | #define L1_CACHE_BYTES 256 |
| 15 | #define L1_CACHE_SHIFT 8 | 15 | #define L1_CACHE_SHIFT 8 |
| 16 | #define NET_SKB_PAD 32 | ||
| 16 | 17 | ||
| 17 | #define __read_mostly __attribute__((__section__(".data..read_mostly"))) | 18 | #define __read_mostly __attribute__((__section__(".data..read_mostly"))) |
| 18 | 19 | ||