netdev - Re: 2.6.23.1-smp kernel panic (network-related)

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Message-ID: <20071107193843.1f3fa2f4@catlap>
Date:	Wed, 7 Nov 2007 19:38:43 +0100
From:	Marek Kierdelewicz <marek@...a.pl>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	netdev@...r.kernel.org
Subject: Re: 2.6.23.1-smp  kernel panic (network-related)

>What is the test input that causes the crash??

Test box is treated with mirrored traffic that is routed by production
linux router (with non-smp kernel). It's usual traffic generated by
broadband clients. Some of the characteristics:

bandwidth used: ~40/40 Mbit (up/down)
pps: ~15k

number of clients: ~550

dump of packet sizes:
 Packet size  | Count
1 to   75:     186501
76 to  150:     14145
151 to  225:     3285
226 to  300:     2088
301 to  375:     3632
376 to  450:     2097
451 to  525:     1513
526 to  600:     3069
601 to  675:    20081
676 to  750:     1294
751 to  825:     1189
826 to  900:      885
901 to  975:     2207
976 to 1050:     1333
1051 to 1125:    1192
1201 to 1275:    3036
1276 to 1350:    3709
1351 to 1425:    3453
1426 to 1500+: 185318

protocol breakdown:
most of the traffic is IPv4, some UDP and a little bit of ICMP

Don't know if it's important, but box is connected to switch by a
802.1q trunk. Each of vlan interfaces has egress shaping on it +
dedicated ifb device attached to ingress qdisc and ingress shaping on
ifb device.

Is any additional information needed?

-- 
Marek Kierdelewicz
Kierownik Działu Systemów Sieciowych, KoBa
Manager of Network Systems Department, KoBa
tel. (85) 7406466; fax. (85) 7406467
e-mail: admin@...a.pl
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