netdev - Re: [RFC PATCH] dont create cached routes from ARP requests

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Message-ID: <1285342083.2503.252.camel@edumazet-laptop>
Date:	Fri, 24 Sep 2010 17:28:03 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ulrich Weber <ulrich.weber@...glemail.com>
Cc:	Ulrich Weber <uweber@...aro.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [RFC PATCH] dont create cached routes from ARP requests

Le vendredi 24 septembre 2010 à 17:00 +0200, Ulrich Weber a écrit :
> Hi Eric,
> 
> please find the output in the attached text file.
> 
> Neighbor garbage collection wont't work because all
> neighbor records are bound to cached routes.
> 
> Forced route garbaged collections returns without freeing
> any routes, probably because the route threshold is quite high
> with 65536 compared to the small neighbor threshold of 1024,
> resulting in a fixed amount of 1024 cached routes...
> 
> Instead of running the garbage collection we could flush the route
> cache completely if the neighbor cache overflows.
> But why do we have to cache that routes in first place ?
> See the previous patch which skips caching for that kind of routes.

What are the packets you receive ? A flood of ARP answers ?

a "tcpdump -X" of a few packets would help to understand.



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