netdev - Re: [PATCH 0/4] Make tcp-metrics source-address aware

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Message-ID: <1387132859.19078.207.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Sun, 15 Dec 2013 10:40:59 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Christoph Paasch <christoph.paasch@...ouvain.be>,
	Yuchung Cheng <ycheng@...gle.com>
Cc:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
	Julian Anastasov <ja@....bg>
Subject: Re: [PATCH 0/4] Make tcp-metrics source-address aware

On Sun, 2013-12-15 at 13:10 +0100, Christoph Paasch wrote:
> Currently tcp-metrics only stores per-destination addresses. This brings
> problems, when a host has multiple interfaces (e.g., a smartphone having
> WiFi/3G):
> 
> For example, a host contacting a server over WiFi will store the tcp-metrics
> per destination IP. If then the host contacts the same server over 3G, the 
> same tcp-metrics will be used, although the path-characteristics are completly
> different (e.g., the ssthresh is probably not the same).

ssthresh caching is very problematic anyway.

hystart is way better to probe the actual capacity, as the real network 
conditions change every seconds or so.

> 
> The same holds for the fast-open cookie. The server will generate a cookie
> based on our source-address. So, if we contact the same server with another
> source-IP we should request a new cookie.

Yuchung, what do you think ? I think this should already be handled
gracefully, as client be behind a NAT device using a pool of external IP
addresses ?

Thanks Christoph !


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