netdev - Re: Difficulties to get 1Gbps on be2net ethernet card

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Date:	Wed, 30 May 2012 11:56:14 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jean-Michel Hautbois <jhautbois@...il.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: Difficulties to get 1Gbps on be2net ethernet card

On Wed, 2012-05-30 at 11:40 +0200, Jean-Michel Hautbois wrote:

> I used vmstat in order to see the differences between the two kernels.
> The main difference is the number of interrupts per second.
> I have an average of 87500 on 3.2 and 7500 on 2.6, 10 times lower !
> I suspect the be2net driver to be the main cause, and I checkes the
> /proc/interrupts file in order to be sure.
> 
> I have for eth1-tx on 2.6.26 about 2200 interrupts per second and 23000 on 3.2.
> BTW, it is named eth1-q0 on 3.2 (and tx and rx are the same IRQ)
> whereas there is eth1-rx0 and eth1-tx on 2.6.26.
> 

Might be different coalescing params :

ethtool -c eth1



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