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List:       linuxppc-embedded
Subject:    Re: [linux kernel 2.6.19] ethernet driver for Marvell bridge GT-64260
From:       "Dale Farnsworth" <dale () farnsworth ! org>
Date:       2007-08-31 16:43:43
Message-ID: 20070831164343.452.qmail () farnsworth ! org
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> 
> I am porting linux kernel 2.6.19 on a platform based on PPC750FX together 
> with a Marvell GT64260.
> I use a patched 643xx driver which is back ported to 64260 by Steven J. 
> Hill.
> I have ethernet now up and running, but only if I switch debug on, which 
> generates a big bunch of screen messages.
> As soon as I switch debug off, I get the message "Virtual device %s asks 
> to queue packet!" on every transmission request.
> 
> This happens on ping an other system.
> 
> Has anyone experience in such an event? Is there anything how I can speed 
> up performance with the 64260?
> Is there a similar problem known with the 64360?

No, this does not happen on the mv64360.  As I recall, that message occurs
when something attempts to queue a packet to a driver that has called
netif_stop_queue() but hasn't yet called netif_wake_queue().  I would
guess that when you turn debug on, you are changing the driver logic
in addition to the timing.

-Dale
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