netdev - Re: resurrecting tcphealth

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Date:	Mon, 16 Jul 2012 17:24:37 +0200
From:	Christoph Paasch <christoph.paasch@...ouvain.be>
To:	Piotr Sawuk <a9702387@...t.univie.ac.at>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: resurrecting tcphealth

On Monday 16 July 2012 17:12:26 Piotr Sawuk wrote:
> +               seq_printf(seq, "%d: %-21pI4:%u %-21pI4:%u "
> +                               "%8u %8lu %8lu %8lu %8lu%n",
> +                               st->num,
> +                               &inet->inet_rcv_saddr,
> +                               ntohs(inet->inet_sport),
> +                               &inet->inet_daddr,
> +                               ntohs(inet->inet_dport),
> +                               jiffies_to_msecs(tp->srtt),

This still doesn't gives you the correct RTT.
srtt is in jiffies * 8.

You should do jiffies_to_msecs(tp->srtt) >> 3.

The RTT is already exposed by tcp_info anyway... (see tcp_get_info() - where 
you also see the bitshift)


Christoph

-- 
IP Networking Lab --- http://inl.info.ucl.ac.be
MultiPath TCP in the Linux Kernel --- http://mptcp.info.ucl.ac.be
Université Catholique de Louvain
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