From: Eric Dumazet <edumazet@google.com>
Date: Thu, 20 Mar 2014 04:02:21 +0000 (-0700)
Subject: tcp: syncookies: do not use getnstimeofday()
X-Git-Tag: v3.14-rc8~3^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=632623153196bf183a69686ed9c07eee98ff1bf8;p=pandora-kernel.git

tcp: syncookies: do not use getnstimeofday()

While it is true that getnstimeofday() uses about 40 cycles if TSC
is available, it can use 1600 cycles if hpet is the clocksource.

Switch to get_jiffies_64(), as this is more than enough, and
go back to 60 seconds periods.

Fixes: 8c27bd75f04f ("tcp: syncookies: reduce cookie lifetime to 128 seconds")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Florian Westphal <fw@strlen.de>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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