On Tue, 2012-04-10 at 15:26 +0100, Ian Campbell wrote:

This reduces the minimum overhead required for this allocation such that the
shinfo can be grown in the following patch without overflowing 2048 bytes for a
1500 byte frame.

Reducing this overhead while also growing the shinfo means that sometimes the
tail end of the data can end up in the same cache line as the beginning of the
shinfo. Specifically in the case of the 64 byte cache lines on a 64 bit system
the first 8 bytes of shinfo can overlap the tail cacheline of the data. In many
cases the allocation slop means that there is no overlap.

Signed-off-by: Ian Campbell <redacted>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <redacted>
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Acked-by: Eric Dumazet <redacted>