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authorHerbert Xu <herbert@gondor.apana.org.au>2007-12-14 15:28:14 +0100
committerHerbert Xu <herbert@gondor.apana.org.au>2008-01-10 22:16:55 +0100
commite7cd2514ea506f06bd4f7b13a9b62afd60f9c73b (patch)
tree66c46a54a2841091165a0b8083329c41f3504847 /fs/nfs_common
parent[CRYPTO] seqiv: Add select AEAD in Kconfig (diff)
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[CRYPTO] chainiv: Avoid lock spinning where possible
This patch makes chainiv avoid spinning by postponing requests on lock contention if the user allows the use of asynchronous algorithms. If a synchronous algorithm is requested then we behave as before. This should improve IPsec performance on SMP when two CPUs attempt to transmit over the same SA. Currently one of them will spin doing nothing waiting for the other CPU to finish its encryption. This patch makes it postpone the request and get on with other work. If only one CPU is transmitting for a given SA, then we will process the request synchronously as before. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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