netdev - Re: appearing again: kernel: eth0: too many iterations (6) in nv_nic

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Message-ID: <20080128080656.1cc8a4e0@deepthought>
Date:	Mon, 28 Jan 2008 08:06:56 -0800
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	carlos@...ica.ufpr.br (Carlos Carvalho)
Cc:	netdev@...r.kernel.org
Subject: Re: appearing again: kernel: eth0: too many iterations (6) in
 nv_nic_irq

On Mon, 28 Jan 2008 11:32:55 -0200
carlos@...ica.ufpr.br (Carlos Carvalho) wrote:

> It seems that this problem with NVidia's nic comes up more and more...
> From time to time we get this in the log:
> 
> Jan 27 14:43:12 duvel kernel: eth0: too many iterations (6) in nv_nic_irq.
> 
> We algo get
> 
> Jan 27 11:32:43 duvel kernel: KERNEL: assertion ((int)tcp_packets_in_flight(tp) >= 0) failed at net/ipv4/tcp_input.c (1274)
> 
> But at different moments, as shown above. Are they related? What's the
> meaning of the "assertion failed" one?
> 
> The messages are more likely to appear when traffic is high
> (>500Mb/s). This is with 2.6.22.16.
> 
> Any suggestions?
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> 

Use NAPI which is available as configuration option in this driver.

Increase the max_interrupt_work from the ridiculously low value of 5
to something more larger like 15, with module parameter in /etc/modprobe.d/options:

options forcedeth max_interrupt_work=15

Also, see if you motherboard supports MSI, if so add "msi=1" module parameter

-- 
Stephen Hemminger <stephen.hemminger@...tta.com>
--
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