diff options
author | Maciej Sosnowski <maciej.sosnowski@intel.com> | 2009-02-26 05:05:17 -0500 |
---|---|---|
committer | Dan Williams <dan.j.williams@intel.com> | 2009-03-04 18:04:40 -0500 |
commit | 5de22343b2303b278ab562e5d166ffe306566d30 (patch) | |
tree | 6c48b83e1dc60afb6d22d3afc74058bbcfaa87d7 | |
parent | 2b8a6bf896ef47cc7d84c503079cc7b99789f9fa (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.h | 4 |
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 | } |