netdev - Re: [PATCH v2] tcp: syncookies: do not use getnstimeofday()

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Message-Id: <20140320.162310.224427654050265618.davem@davemloft.net>
Date:	Thu, 20 Mar 2014 16:23:10 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	fw@...len.de, netdev@...r.kernel.org
Subject: Re: [PATCH v2] tcp: syncookies: do not use getnstimeofday()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 19 Mar 2014 21:02:21 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> 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@...gle.com>

Applied, thanks Eric.
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