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Subjectrx_copybreak value for non-i386 architectures

I notice that many net drivers set rx_copybreak to 1518 (the max packet size)
for non-i386 architectures. Once I thought I understood it and it seems
related to cache line alignment. However, I am not sure exactly about the
reason now. Can someone enlighten me a little bit?

Basically I try to understand whether for MIPS architectures we need to set
this value as well.

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