Commit dd30ac32 authored Feb 17, 2011 by Horst Hartmann Committed by Martin Schwidefsky Feb 17, 2011

[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>

parent 7657e41a

arch/s390/include/asm/cache.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -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")))