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[XFRM]: Optimize MTU calculation
authorPatrick McHardy <kaber@trash.net>
Mon, 9 Apr 2007 18:47:18 +0000 (11:47 -0700)
committerDavid S. Miller <davem@sunset.davemloft.net>
Thu, 26 Apr 2007 05:28:38 +0000 (22:28 -0700)
Replace the probing based MTU estimation, which usually takes 2-3 iterations
to find a fitting value and may underestimate the MTU, by an exact calculation.

Also fix underestimation of the XFRM trailer_len, which causes unnecessary
reallocations.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

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