Re: [PATCH net-next 1/3] mlx4_en: TX ring size default to 1024

[Eric Dumazet <eric.dumazet@xxxxxxxxx>]

Le jeudi 23 février 2012 à 14:45 -0500, David Miller a écrit :
> From: Yevgeny Petrilin <yevgenyp@xxxxxxxxxxxxxx>
> Date: Thu, 23 Feb 2012 15:34:05 +0200
> 
> > Signed-off-by: Yevgeny Petrilin <yevgenyp@xxxxxxxxxxxxxx>
> 
> This is rediculious as a default, yes even for 10Gb.
> 
> Do you have any idea how high latency is going to be for packets
> trying to get into the transmit queue if there are already a
> thousand other frames in there?

Before increasing TX ring sizes, a driver should implement BQL as a
prereq.


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