netdev - Re: resurrecting tcphealth

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Date:	Mon, 16 Jul 2012 13:46:25 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Piotr Sawuk <a9702387@...t.univie.ac.at>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: resurrecting tcphealth

On Mon, 2012-07-16 at 13:33 +0200, Piotr Sawuk wrote:
> On Sa, 14.07.2012, 01:55, Stephen Hemminger wrote:
> > I am not sure if the is really necessary since the most
> > of the stats are available elsewhere.
> 
> if by "most" you mean address and port then you're right.
> but even the rtt reported by "ss -i" seems to differ from tcphealth.

Thats because tcphealth is wrong, it assumes HZ=1000 ?

tp->srtt unit is jiffies, not ms.

tcphealth is a gross hack.


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