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authorMaciej Sosnowski <maciej.sosnowski@intel.com>2008-07-22 17:30:57 -0700
committerDan Williams <dan.j.williams@intel.com>2008-07-22 17:30:57 -0700
commit16a37acaaf4aaa631ba3f83710ed6cdb1a597520 (patch)
tree5826c763c70dc6b798c0d12216a80f4596dec284 /net/core
parent09177e85d6a0bffac8b55afd28ed8b82bd873f0b (diff)
downloadop-kernel-dev-16a37acaaf4aaa631ba3f83710ed6cdb1a597520.zip
op-kernel-dev-16a37acaaf4aaa631ba3f83710ed6cdb1a597520.tar.gz
I/OAT: tcp_dma_copybreak default value dependent on I/OAT version
I/OAT DMA performance tuning showed different optimal values of tcp_dma_copybreak for different I/OAT versions (4096 for 1.2 and 2048 for 2.0). This patch lets ioatdma driver set tcp_dma_copybreak value according to these results. [dan.j.williams@intel.com: remove some ifdefs] Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/user_dma.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/core/user_dma.c b/net/core/user_dma.c
index 0ad1cd5..de76050 100644
--- a/net/core/user_dma.c
+++ b/net/core/user_dma.c
@@ -34,6 +34,7 @@
#define NET_DMA_DEFAULT_COPYBREAK 4096
int sysctl_tcp_dma_copybreak = NET_DMA_DEFAULT_COPYBREAK;
+EXPORT_SYMBOL(sysctl_tcp_dma_copybreak);
/**
* dma_skb_copy_datagram_iovec - Copy a datagram to an iovec.
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