netdev - Re: Kernel Panic on OOM with 10 HTB rules

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Date:	Wed, 08 Sep 2010 14:42:58 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Anand Raj Manickam <anandrm@...il.com>
Cc:	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
	shemminger@...tta.com
Subject: Re: Kernel Panic on OOM with 10 HTB rules

Le mercredi 08 septembre 2010 à 16:22 +0530, Anand Raj Manickam a
écrit :
> Hi,
> 
> I m struck with
> Kernel Panic - Out of Memory Issue  when  traffic  is more than 100k
> pps  and have  around 10 tc rules.
> 
> There is NO kernel panic with 1 tc rule .
> 
> I using a 2.6.34.6 ( latest stable kernel) with SMP enabled
> 
> The rules are simple -
> 10 iptable rules :
> iptables -t mangle -I FORWARD -s x.x.x.x  -j CLASSIFY --set-class 0xz:0xy
> 
> 10 tc rules :
> tc  class add dev imq0 parent 1:z classid 1:y htb rate 2kbit ceil 32768kbps
> 
> I m using  Intel Xeon Quad core x5570, 12GB RAM , with 8 e1000e , irq
> affined ( 1 pair per core)
> 
> There is NO issue / CRASH with multiple iptable rules marking to the
> same tc rule/HTB class , i can sucessfully pass more than 200k pps /
> 800Mbps traffic .
> 
> But when each iptable rule is marking to seprate tc rule/HTB class and
> when the traffic exceeds 100K pps / 20000 connections per second , we
> hit this Out of Memory - Kernel panic condition .
> Any help is appreciated . Do let me know if any more further
> information is need.

Hi Anand

Could you give :

1) A complete stack trace / panic report
2) cat /proc/interrupts
3) ifconfig -a
4) cat /proc/sys/vm/min_free_kbytes
5) cat /proc/meminfo

for each eth*
 ethtool -g eth*



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