netdev - Re: 2.6.35-rc2, CONFIG_RPS is filling the dmesg log

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Message-ID: <4C0F96B4.2000307@canonical.com>
Date:	Wed, 09 Jun 2010 07:27:16 -0600
From:	Tim Gardner <tim.gardner@...onical.com>
To:	netdev <netdev@...r.kernel.org>
Subject: Re: 2.6.35-rc2, CONFIG_RPS is filling the dmesg log

On 06/08/2010 02:55 PM, Tim Gardner wrote:
> With 2.6.35-rc2 my dmesg log is being flooded with messages like this:
>
> br0 received packet on queue 4, but number of RX queues is 1
>
> This machine is bridged for KVM and has 2 igb network adapters.
>
> The root cause appears to be CONFIG_RPS=y and the fact that none of the
> drivers that call skb_record_rx_queue() perform their net device
> allocation using alloc_netdev_mq(), thereby initializing num_rx_queues
> to a maximum of 1.
>
> Given that this is early RPS days, is the warning in get_rps_cpu()
> really necessary? It would appear that _all_ of the multi-receive queue
> devices that call skb_record_rx_queue() will cause this log noise.
>
> By the way, how do you turn off CONFIG_RPS? The only way I could get it
> disabled was to change the default in net/Kconfig to 'n'.
>
> rtg

This is the route that I'm taking with Ubuntu in the short term. I'll 
have lots of server testers complaining pretty soon if I don't take care 
of this now. It does keep my server logs from filling.

rtg

-- 
Tim Gardner tim.gardner@...onical.com

View attachment "0001-net-Print-num_rx_queues-imbalance-warning-only-when-.patch" of type "text/x-patch" (1211 bytes)