Commit dd30ac32 authored by Horst Hartmann's avatar Horst Hartmann Committed by Martin Schwidefsky

[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: default avatarHorst Hartmann <horsth@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 7657e41a
...@@ -13,6 +13,7 @@ ...@@ -13,6 +13,7 @@
#define L1_CACHE_BYTES 256 #define L1_CACHE_BYTES 256
#define L1_CACHE_SHIFT 8 #define L1_CACHE_SHIFT 8
#define NET_SKB_PAD 32
#define __read_mostly __attribute__((__section__(".data..read_mostly"))) #define __read_mostly __attribute__((__section__(".data..read_mostly")))
......
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