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[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)
commitdd30ac327481f1663b6526fa9fa078569188b7cc
tree7e78bdbafc46bf0e70b89857c29c102676693d74tree | snapshot (tar.gz zip)
parent7657e41a0bd16c9d8b3cefe8fd5d6ac3c25ae4bfcommit | 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>
arch/s390/include/asm/cache.h diff | blob | blame | history