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Date: Tue, 09 Nov 2004 11:40:26 -0700
From: "Jeff V. Merkey" <jmerkey@drdos.com>
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To: Patrick McHardy <kaber@trash.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.6.9 RCU breakage in dev_queue_xmit
References: <4190FFE9.8000203@drdos.com> <419108ED.9090608@trash.net>
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Patrick McHardy wrote:

> Jeff V. Merkey wrote:
>
>>
>> Running dual gigabit interfaces at 196 MB/S (megabytes/second) on 
>> receive, 12 CLK interacket gap time, 1500 bytes payload
>> at 65000 packets per second per gigabit interface, and retransmitting 
>> received packets at 130 MB/S out of a third gigabit interface
>> with skb, RCU locks in dev_queue_xmit breaks and enters the following 
>> state:
>>
>> Nov  8 15:38:08 ds kernel: Badness in local_bh_enable at 
>> kernel/softirq.c:141
>> Nov  8 15:38:08 ds kernel:  [<40107d1e>] dump_stack+0x1e/0x30
>> Nov  8 15:38:08 ds kernel:  [<401218b0>] local_bh_enable+0x70/0x80
>> Nov  8 15:38:08 ds kernel:  [<402c5bbb>] dev_queue_xmit+0x11b/0x250
>> Nov  8 15:38:08 ds kernel:  [<f8981cb7>] xmit_skb+0x17/0x20 [dsfs]
>> Nov  8 15:38:08 ds kernel:  [<f8981f8e>] xmit_packet+0x2e/0x80 [dsfs]
>> Nov  8 15:38:08 ds kernel:  [<f89820eb>] regen_data+0x10b/0x290 [dsfs]
>
>
> There is no such function in the 2.6.9 kernel.


Check /include/linux for local_bh_enable and /net/core/dev.c .

Jeff

>
> Regards
> Patrick
>
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