igb: Only DMA sync frame length

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On some platforms, syncing a buffer for DMA is expensive. Rather than
sync the whole 2K receive buffer, only synchronise the length of the
frame, which will typically be the MTU, or a much smaller TCP ACK.

For an IMX6Q, this gives around 6% increased TCP receive performance,
which is cache operations bound and reduces CPU load for TCP transmit.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

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Andrew Lunn 2016-06-03 23:03:25 +02:00 • committed by Jeff Kirsher

parent 581e0c7df9

commit 64f2525ca4

1 changed files with 4 additions and 3 deletions

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7

drivers/net/ethernet/intel/igb/igb_main.c

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