From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [RFC v2] tcp: Export TCP Delayed ACK parameters to user
Date: Fri, 28 Oct 2011 17:19:04 -0400 (EDT)
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From: Daniel Baluta <dbaluta@ixiacom.com>
Date: Sat, 29 Oct 2011 00:14:03 +0300

> +static inline int tcp_delack_thresh(const struct sock *sk)
> +{
> +	return inet_csk(sk)->icsk_ack.rcv_mss * sysctl_tcp_delack_segs;
> +}
> +

Please turn this into a shift or something, you're adding a multiply
into a core code path.