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authorMaciej Sosnowski <maciej.sosnowski@intel.com>2009-02-26 05:05:17 -0500
committerDan Williams <dan.j.williams@intel.com>2009-03-04 18:04:40 -0500
commit5de22343b2303b278ab562e5d166ffe306566d30 (patch)
tree6c48b83e1dc60afb6d22d3afc74058bbcfaa87d7
parent2b8a6bf896ef47cc7d84c503079cc7b99789f9fa (diff)
I/OAT: set tcp_dma_copybreak to 256k for I/OAT ver.3
Upcoming server platforms from Intel based on the Nehalem performance have significantly improved CPU based copy performance. However, the DMA engine can still be effective at higher I/O sizes for TCP traffic and at this time copybreak should be set to 256k for TCP traffic only. Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com> Signed-off-by: Shannon Nelson <shannon.nelson@intel.com> Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
-rw-r--r--drivers/dma/ioatdma.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/dma/ioatdma.h b/drivers/dma/ioatdma.h
index a3306d0e1372..dcf8db513c3a 100644
--- a/drivers/dma/ioatdma.h
+++ b/drivers/dma/ioatdma.h
@@ -135,12 +135,14 @@ static inline void ioat_set_tcp_copy_break(struct ioatdma_device *dev)
135 #ifdef CONFIG_NET_DMA 135 #ifdef CONFIG_NET_DMA
136 switch (dev->version) { 136 switch (dev->version) {
137 case IOAT_VER_1_2: 137 case IOAT_VER_1_2:
138 case IOAT_VER_3_0:
139 sysctl_tcp_dma_copybreak = 4096; 138 sysctl_tcp_dma_copybreak = 4096;
140 break; 139 break;
141 case IOAT_VER_2_0: 140 case IOAT_VER_2_0:
142 sysctl_tcp_dma_copybreak = 2048; 141 sysctl_tcp_dma_copybreak = 2048;
143 break; 142 break;
143 case IOAT_VER_3_0:
144 sysctl_tcp_dma_copybreak = 262144;
145 break;
144 } 146 }
145 #endif 147 #endif
146} 148}