net: fs_enet: make rx_copybreak value configurable

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Measurement shows that on a MPC8xx running at 132MHz, the optimal
limit is 112:
* 114 bytes packets are processed in 147 TB ticks with higher copybreak
* 114 bytes packets are processed in 148 TB ticks with lower copybreak
* 128 bytes packets are processed in 154 TB ticks with higher copybreak
* 128 bytes packets are processed in 148 TB ticks with lower copybreak
* 238 bytes packets are processed in 172 TB ticks with higher copybreak
* 238 bytes packets are processed in 148 TB ticks with lower copybreak

However it might be different on other processors
and/or frequencies. So it is useful to make it configurable.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Christophe Leroy 2016-09-09 14:26:25 +02:00 • committed by David S. Miller

parent 070e1f0182

commit b0ba357bfb

1 changed files with 40 additions and 0 deletions

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drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c

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