[S390] net: provide architecture specific NET_SKB_PAD
authorHorst Hartmann <horsth@linux.vnet.ibm.com>
Thu, 17 Feb 2011 12:13:59 +0000 (13:13 +0100)
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>
Thu, 17 Feb 2011 12:13:59 +0000 (13:13 +0100)
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>
arch/s390/include/asm/cache.h

index 24aafa68b64367a8ff1e68c91981d15c2ee51afd..2a30d5ac0667aa6285eef8c3bb95a86ad04db809 100644 (file)
@@ -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")))