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| author | Maciej Sosnowski <maciej.sosnowski@intel.com> | 2009-02-26 11:05:17 +0100 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2009-03-04 16:04:40 -0700 |
| commit | 5de22343b2303b278ab562e5d166ffe306566d30 (patch) | |
| tree | 6c48b83e1dc60afb6d22d3afc74058bbcfaa87d7 /drivers/dma | |
| parent | 2b8a6bf896ef47cc7d84c503079cc7b99789f9fa (diff) | |
| download | linux-5de22343b2303b278ab562e5d166ffe306566d30.tar.gz linux-5de22343b2303b278ab562e5d166ffe306566d30.tar.bz2 linux-5de22343b2303b278ab562e5d166ffe306566d30.zip | |
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>
Diffstat (limited to 'drivers/dma')
| -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) #ifdef CONFIG_NET_DMA switch (dev->version) { case IOAT_VER_1_2: - case IOAT_VER_3_0: sysctl_tcp_dma_copybreak = 4096; break; case IOAT_VER_2_0: sysctl_tcp_dma_copybreak = 2048; break; + case IOAT_VER_3_0: + sysctl_tcp_dma_copybreak = 262144; + break; } #endif } |