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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2009-05-26 18:50:26 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-05-27 03:26:00 -0700 |
| commit | 30a3ae30c775e2723f86ef70746ad3cb4404a4c9 (patch) | |
| tree | 9a3365e4a2b611930f31674a0162126625adac10 | |
| parent | 4a9a2968a17eae42ef5dffca8b37534c864e30cc (diff) | |
| download | linux-3.10-30a3ae30c775e2723f86ef70746ad3cb4404a4c9.tar.gz linux-3.10-30a3ae30c775e2723f86ef70746ad3cb4404a4c9.tar.bz2 linux-3.10-30a3ae30c775e2723f86ef70746ad3cb4404a4c9.zip | |
tcp: Optimise len/mss comparison
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>
| -rw-r--r-- | net/ipv4/tcp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 313960e4cfd..68342d43189 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -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)) { |