netdev - Re: Problem wit route cache

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Date:	Mon, 08 Feb 2010 14:28:10 +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: Problem wit route cache

Le lundi 08 février 2010 à 14:16 +0100, Paweł Staszewski a écrit :
> Hello
> 
>  From some time i have problem with route cache in linux
> this is an info that i have in dmesg:
> 
> Route hash chain too long!
> Adjust your secret_interval!
> Route hash chain too long!
> Adjust your secret_interval!
> Route hash chain too long!
> Adjust your secret_interval!
> Route hash chain too long!
> Adjust your secret_interval!
> Route hash chain too long!
> Adjust your secret_interval!
> Route hash chain too long!
> Adjust your secret_interval!
> Route hash chain too long!
> Adjust your secret_interval!
> Route hash chain too long!
> Adjust your secret_interval!
> vlan0811: 9 rebuilds is over limit, route caching disabled
> Route hash chain too long!
> Adjust your secret_interval!
> 
> The problem is that change of  net.ipv4.route.secret_interval is change 
> nothing -- no matter that i set secret_interval from dfault 3600 to 2 or 
> 10000 i have always the same info about route cahce is disabled.
> Also i change this parameter net.ipv4.rt_cache_rebuild_count from 
> default 4 to 9 and the same info - i try also change this to 12 but also 
> this change nothing.
> 
> The machine that have this info is:
> 2x Intel(R) Xeon(R) CPU           X5450  @ 3.00GHz
> 12GB of RAM
> 

Are you running a 64bit kernel ?
What is your kernel version ?

Please send :

# grep . /proc/sys/net/ipv4/route/*
#rtstat -c10 -i1



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