netdev - Re: [RFC v2] tcp: Export TCP Delayed ACK parameters to user

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Message-ID: <CAEnQRZCxSPb8NRceB+tfdZnkN=K-jGbdmXDgNwEhZFYAWGmvAg@mail.gmail.com>
Date:	Sat, 29 Oct 2011 00:35:24 +0300
From:	Daniel Baluta <dbaluta@...acom.com>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, kuznet@....inr.ac.ru, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net, netdev@...r.kernel.org,
	luto@...capital.net, rick.jones2@...com
Subject: Re: [RFC v2] tcp: Export TCP Delayed ACK parameters to user

On Sat, Oct 29, 2011 at 12:19 AM, David Miller <davem@...emloft.net> wrote:
> From: Daniel Baluta <dbaluta@...acom.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.

Is there any generic API to do this? Default case is not
affected since tcp_delack_segs is 1.

Daniel.
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