Re: Problem wit route cache

["Paweł Staszewski" <pstaszewski@itcare.pl>]

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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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>    


[-- Attachment #2: rtstat.txt --]
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rtstat -c10 -i1
rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|
 entries|  in_hit|in_slow_|in_slow_|in_no_ro|  in_brd|in_marti|in_marti| out_hit|out_slow|out_slow|gc_total|gc_ignor|gc_goal_|gc_dst_o|in_hlist|out_hlis|
        |        |     tot|      mc|     ute|        |  an_dst|  an_src|        |    _tot|     _mc|        |      ed|    miss| verflow| _search|t_search|
   12082|3440217296|6456413873|       0|  623094|     294|       0|       3|  735116| 5701062|       0|261260739|261040365|       0|       0|654617961|  179044|
   10037|       0|  152142|       0|       7|       0|       0|       0|       0|     123|       0|       0|       0|       0|       0|       0|       0|
   12032|       0|  155770|       0|       4|       0|       0|       0|       0|     122|       0|       0|       0|       0|       0|       0|       0|
   10991|       0|  161040|       0|       7|       0|       0|       0|       0|     129|       0|       0|       0|       0|       0|       0|       0|
    9898|       0|  155503|       0|       9|       0|       0|       0|       0|     125|       0|       0|       0|       0|       0|       0|       0|
   12553|       0|  157455|       0|       6|       0|       0|       0|       0|     129|       0|       0|       0|       0|       0|       0|       0|
   10983|       0|  157742|       0|       9|       0|       0|       0|       0|     128|       0|       0|       0|       0|       0|       0|       0|
    9375|       0|  158226|       0|       8|       0|       0|       0|       0|     115|       0|       0|       0|       0|       0|       0|       0|
   11929|       0|  159342|       0|      10|       0|       0|       0|       0|     130|       0|       0|       0|       0|       0|       0|       0|
   11046|       0|  158015|       0|       8|       0|       0|       0|       0|     126|       0|       0|       0|       0|       0|       0|       0|