netdev - Re: BUG: unable to handle kernel paging request at 000041ed00000001

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Date:	Mon, 14 Jun 2010 12:27:34 +0300
From:	Arturas <arturasl@....lt>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: BUG: unable to handle kernel paging request at 000041ed00000001


On Jun 14, 2010, at 11:31 AM, Eric Dumazet wrote:
> But your problem is about bridge, not bonding (see trace).
I want it for performance reason, not because of this bug.
Bridge isn't a bottleneck for me, but bonding may be and not to me only,
but for many people. I believe that performance gain would be more 
than 1% on cpu? :-)

> 
> And 2.6.34 wont accept such changes, its already released.
It can be as a separate patch or I can test 2.3.35 if it would accept
such change. I just need a stable kernel with good performance :-)

> 
>> I also have another issue with NMI. On older machine with 5500 xeons i 
>> have almost no overhead with nmi_watchdog enabled, but on this it is about twice.
>> without nmi enabled cpu peak average is 30%, and with nmi enabled i have 53%.
>> When traffic is not passing all cpus are idling at 100%.
>> Maybe overhead could be a little bit smaller? :-)
>> 
> 
> I am a bit lost here, NMI have litle to do with network stack ;)
May this be related to very recent cpu? As i understand NMI depends on CPU.

> 
> 
> Could you please test another patch ?
Applied, it's working correctly for now. If i'll get a warning i'll write you or maybe I
shouldn't get it if a patch is correct?

> 
> Before calling sk_tx_queue_set(sk, queue_index); we should check if dst
> dev is current device.

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