netdev - Re: Problem wit route cache

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Message-ID: <4B7012BC.9000702@itcare.pl>
Date:	Mon, 08 Feb 2010 14:33:48 +0100
From:	Paweł Staszewski <pstaszewski@...are.pl>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Linux Network Development list <netdev@...r.kernel.org>
Subject: Re: Problem wit route cache

W dniu 2010-02-08 14:28, Eric Dumazet pisze:
> 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
>
>    
Yes this is x86_64 kernel
i kernels  2.6.32.2 /  2.6.32.7 and now 2.6.33-rc6-git5 and on all 
kernels the same thing happens.
grep . /proc/sys/net/ipv4/route/*
/proc/sys/net/ipv4/route/error_burst:1250
/proc/sys/net/ipv4/route/error_cost:250
grep: /proc/sys/net/ipv4/route/flush: Permission denied
/proc/sys/net/ipv4/route/gc_elasticity:2
/proc/sys/net/ipv4/route/gc_interval:2
/proc/sys/net/ipv4/route/gc_min_interval:0
/proc/sys/net/ipv4/route/gc_min_interval_ms:500
/proc/sys/net/ipv4/route/gc_thresh:65535
/proc/sys/net/ipv4/route/gc_timeout:300
/proc/sys/net/ipv4/route/max_size:524288
/proc/sys/net/ipv4/route/min_adv_mss:256
/proc/sys/net/ipv4/route/min_pmtu:552
/proc/sys/net/ipv4/route/mtu_expires:600
/proc/sys/net/ipv4/route/redirect_load:5
/proc/sys/net/ipv4/route/redirect_number:9
/proc/sys/net/ipv4/route/redirect_silence:5120
/proc/sys/net/ipv4/route/secret_interval:2

This happens not all the time.
I have this info only when there are "internet rush hours" - thn there 
is about 700Mbit/s TX + 700Mbit/s RX forwarded traffic


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