netdev - Re: [RFC PATCHv2 net-next 1/2] tcp: RTO Restart (RTOR)

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Date:	Tue, 08 Dec 2015 05:47:10 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Per Hurtig <per.hurtig@....se>
Cc:	davem@...emloft.net, edumazet@...gle.com, ncardwell@...gle.com,
	nanditad@...gle.com, tom@...bertland.com, ycheng@...gle.com,
	viro@...iv.linux.org.uk, fw@...len.de, mleitner@...hat.com,
	daniel@...earbox.net, willemb@...gle.com,
	ilpo.jarvinen@...sinki.fi, pasi.sarolahti@....fi,
	stephen@...workplumber.org, netdev@...r.kernel.org,
	anna.brunstrom@....se, apetlund@...ula.no, michawe@....uio.no,
	mohammad.rajiullah@....se
Subject: Re: [RFC PATCHv2 net-next 1/2] tcp: RTO Restart (RTOR)

On Tue, 2015-12-08 at 10:19 +0100, Per Hurtig wrote:

> +static u32 tcp_unsent_pkts(const struct sock *sk, u32 ulimit)
> +{
> +	struct sk_buff *skb = tcp_send_head(sk);
> +	u32 pkts = 0;
> +
> +	if (skb)
> +		tcp_for_write_queue_from(skb, sk) {
> +			pkts += tcp_skb_pcount(skb);
> +
> +			if (ulimit && pkts >= ulimit)
> +				return ulimit;
> +		}
> +
> +	return pkts;
> +}


Considering Yuchung feedback, have you looked at using an approximation
instead ? 

(ie using tp->write_seq - tp->snd_nxt)


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