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authorEric Dumazet <edumazet@google.com>2015-05-01 10:37:49 -0700
committerDavid S. Miller <davem@davemloft.net>2015-05-01 19:44:00 -0400
commit355b590ca24a53f5e2f6999218b5321eaf730a7e (patch)
treee6a48af10ed15aca0c6d6a34533aef5636714c1c /init
parent9dd3c797496affd699805c8a9d8429ad318c892f (diff)
downloadlinux-355b590ca24a53f5e2f6999218b5321eaf730a7e.tar.bz2
ipv4: speedup ip_idents_reserve()
Under stress, ip_idents_reserve() is accessing a contended cache line twice, with non optimal MESI transactions. If we place timestamps in separate location, we reduce this pressure by ~50% and allow atomic_add_return() to issue a Request for Ownership. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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