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I/OAT: set tcp_dma_copybreak to 256k for I/OAT ver.3

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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 <[email protected]>
Signed-off-by: Shannon Nelson <[email protected]>
Acked-by: Jeff Kirsher <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Maciej Sosnowski 2009-02-26 11:05:17 +01:00 • committed by Dan Williams
commit 5de22343b2
1 changed files with 3 additions and 1 deletions
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4
drivers/dma/ioatdma.h
View file

@ -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
}