Subject: Re: [PATCH] tcp: syncookies: do not use getnstimeofday()

From: Florian Westphal <[email-masked]>
Date: Wed, 19 Mar 2014 23:56:42 +0100

Eric Dumazet <[email-masked]> wrote:
> While it is true that getnstimeofday() uses about 40 cycles if TSC
> is available, it can use 1600 cycles if hpet is the clocksource.

Ouch.  Why is secure_tcp_sequence_number also using
ktime_get_real/getnstimeofday?

clock drift when other cpu is used?

[ Just curious; I have no objections to this patch ]