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tcp: Optimise len/mss comparison

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Instead of checking len > mss || len == 0, we can accomplish
both by checking (len - 1) > mss using the unsigned wraparound.
At nearly a million times a second, this might just help.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2009-05-26 18:50:26 +00:00 committed by David S. Miller
parent 4a9a2968a1
commit 30a3ae30c7
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/tcp.c
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@ -2566,7 +2566,7 @@ found:
mss = skb_shinfo(p)->gso_size;
flush |= (len > mss) | !len;
flush |= (len - 1) >= mss;
flush |= (ntohl(th2->seq) + skb_gro_len(p)) ^ ntohl(th->seq);
if (flush || skb_gro_receive(head, skb)) {