netdev - Re: [PATCH net-next v2 2/5] tcp: metrics: Add source-address to tcp-metrics

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Message-ID: <1389203751.26646.100.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 08 Jan 2014 09:55:51 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Christoph Paasch <christoph.paasch@...ouvain.be>
Cc:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
	Yuchung Cheng <ycheng@...gle.com>, Julian Anastasov <ja@....bg>
Subject: Re: [PATCH net-next v2 2/5] tcp: metrics: Add source-address to
 tcp-metrics

On Wed, 2014-01-08 at 16:05 +0100, Christoph Paasch wrote:
> We add the source-address to the tcp-metrics, so that different metrics
> will be used per source/destination-pair. We use the destination-hash to
> store the metric inside the hash-table. That way, deleting and dumping
> via "ip tcp_metrics" is easy.

Note that this has the following problem :

Some applications use a set of source IP addresses to overcome the 64K
port limitation.

tcp_metrics uses a hard-coded TCP_METRICS_RECLAIM_DEPTH value of 5,
meaning that cache wont be able to store more than 5 source IP addresses
(reaching one particular remote IP).



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