netdev - Re: Linux stack performance drop (TCP and UDP) in 3.10 kernel in routed scenario

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Message-Id: <20140604.121819.2149110045488849780.davem@davemloft.net>
Date:	Wed, 04 Jun 2014 12:18:19 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	suprasad.desai@...il.com
Cc:	netdev@...r.kernel.org, davem@...emloft.ne
Subject: Re: Linux stack performance drop (TCP and UDP) in 3.10 kernel in
 routed scenario

From: Suprasad Mutalik Desai <suprasad.desai@...il.com>
Date: Wed, 4 Jun 2014 14:34:10 +0530

> I guess plain routing scenario was NOT thought through while removing
> the routing cache code.

It is exactly the scenerio that was considered.

The routing cache was susceptible to trivial denial of service
attacks, it therefore had to be removed.

It also scaled poorly with large numbers of active flows.
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