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Date:	Wed, 23 Oct 2013 14:26:00 +0200
From:	Steffen Klassert <>
To:	Eric Dumazet <>
Cc:	Wolfgang Walter <>,
	David Miller <>,,,
Subject: Re: Big performance loss from 3.4.63 to 3.10.13 when routing ipv4

On Wed, Oct 23, 2013 at 05:00:01AM -0700, Eric Dumazet wrote:
> On Wed, 2013-10-23 at 13:33 +0200, Wolfgang Walter wrote:
> > I don't know what this value actually means. But on 3.4.x it is much higher. 
> > On a machine with 512MB ram it is 32768, on a machine with 1GB ram it is 
> > 262144 and with 16GB ram it is 4194304.
> > 
> Such huge values should not be needed. We should have at most one dst
> per packet in flight.

We have one cache entry for each packet flow we have already seen.
So a static value should be not too high, because remote entities
can control how many cache entries we have, similar to the routing

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