netdev - Re: Linux Route Cache performance tests

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Date:	Mon, 07 Nov 2011 10:08:42 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Paweł Staszewski <pstaszewski@...are.pl>
Cc:	Linux Network Development list <netdev@...r.kernel.org>
Subject: Re: Linux Route Cache performance tests

Le lundi 07 novembre 2011 à 09:36 +0100, Paweł Staszewski a écrit :

> Yes after enabling NUMA I can change rhash_entries on kernel boot.
> 
> And what is the most important for big route cahce is rhash_entries
> if route cache size exceed hash size performance will drop 6x to 8x
> So the best settings for route cache are:
> rhash_entries = gc_thresh = max_size
> 
> Eric tell me what are the plans for removing route cache from kernel ?
> Because as You see with route cache performance is better
> And without route cache performance is not soo good than with route 
> cache enabled but it is stable for all situations even DDOS with 10kk 
> random_ips
> 
> So for the feature we need to prepare for lower kernel IP forwarding 
> performance because of no route cache ?
> Or removing route cache will save some time in IP stack  processing ?
> 

Obviously, cache removal will be possible only when performance without
it is the same.

Work is in progress, it started a long time ago.


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